用 n8n 自动生成电商产品轮播图（Gemini 2.5 + 社媒发布）

上传产品图与描述 → AI 生成 4 张推广图（提示词目标为 9:16） → 自动存储并可选发布到 Instagram/TikTok/YouTube/Facebook

给谁

电商运营、数字营销人员、社媒管理员

你会得到

从单张产品图自动生成 4 张带真人使用场景的推广图（提示词目标为 9:16 竖版，请求未设定尺寸，未经本站实测），并生成社媒文案，可选自动发布

你需要

n8n · fal.ai · imgbb · upload-post.com

步骤

1. 通过表单上传产品图与描述

   首次测试前，先停用或断开「Upload Post」节点（见第 5 步），避免测试运行直接发布到社媒。然后在 n8n 中触发「Photo Upload Form」节点（formTrigger）。上传一张产品图片，并在「Product description」文本框中填写产品描述。提交后，工作流同时向两条分支传递数据：一条进入 AI 故事板分析，另一条进入图片变量合并。

2. AI 生成 4 图故事板（Storyboard Agent）

   「Storyboard Agent」节点调用 Google Gemini 2.5 Pro（通过 googlePalmApi 凭证）分析产品描述，输出严格的 JSON 格式故事板，包含：标题（≤60 字）、4 张图的生成提示词（prompt1-prompt4）、环境描述、音效描述。该节点搭配 Structured Output Parser 确保 JSON 合规，Think 工具辅助推理。

   运行提示词 · 来源原文。Storyboard Agent 节点的 System Message 字段

   复制提示词

   Role: You are a creative director specialized in promotional ads for social media. You will produce a 4-image carousel (vertical 9:16) to promote products. The goal is to create authentic content that generates engagement and conversions.
   
   Content rules:
   
   - ALWAYS include people using the product naturally
   - Add visible promotional text in images (offers, benefits, CTAs)
   - Show product in real usage situations
   - Create attractive compositions for Instagram/TikTok/Facebook
   - Maintain visual coherence between the 4 images
   - Focus on generating engagement and conversion
   - Output strictly valid compact JSON, no prose, no markdown.
   
   Language: Follow the input description language (ES/EN).

   运行提示词 · 来源原文。Storyboard Agent 节点的 Text/Prompt 字段

   复制提示词

   ==Use this product description:
   
   {{ $json["Product description"] }}
   
   Create a promotional carousel of 4 images for social media. Focus on showing the product IN USE by real people with promotional text.
   
   Your task:
   1. Design 4 independent images showing different aspects of the product
   2. Include people using/enjoying the product naturally
   3. Add promotional text elements, benefits or call-to-actions
   4. Create an engaging carousel for Instagram/TikTok/Facebook
   
   For the product context, consider:
   - Real people using the product in everyday situations
   - Visible promotional text (offers, benefits, CTAs)
   - Authentic environments related to product usage
   - Compositions that generate engagement and conversion
   
   Return ONLY a compact JSON with these keys (no prose):
   {
     "title": "<≤60 chars, catchy hook title that captures attention>",
     "prompt1": "<Image 1: Person using the product - vertical 9:16, includes visible promotional text, natural environment>",
     "prompt2": "<Image 2: Key product benefit in use - shows results or satisfaction, with benefit text>",
     "prompt3": "<Image 3: Product in lifestyle context - person enjoying, text with offer or CTA>",
     "prompt4": "<Image 4: Hero shot of product with person - impactful final composition, text with call-to-action>",
     "i2v_prompt1": "Static promotional image for carousel - no animation needed",
     "i2v_prompt2": "Static promotional image for carousel - no animation needed", 
     "i2v_prompt3": "Static promotional image for carousel - no animation needed",
     "i2v_prompt4": "Static promotional image for carousel - no animation needed",
     "environment": "<≤25 words: authentic environment where product is used, real situations>",
     "sound": "<≤20 words: modern catchy commercial music - suitable for social media ads>"
   }
   
   Rules:
   • INCLUDE people using the product naturally and authentically
   • ADD visible promotional text in images (offers, benefits, CTAs)
   • Show product in real usage situations
   • Focus on generating engagement and conversion
   • Attractive compositions for social media
   • Maintain visual coherence between the 4 images
   • Language should follow input description language
   • Output strictly valid JSON

3. 并行生成 4 张推广图并上传 imgbb

   「Set Storyboard Vars」将 JSON 拆解为变量后，工作流并行执行 4 条分支：每条分支通过 HTTP Request 节点调用 fal.run/fal-ai/gemini-25-flash-image/edit（POST），传入对应 prompt 与原始产品图 URL，生成 1 张图；随后 Split Out 拆分、Code 节点重命名为 photo2-photo5、再上传至 imgbb 获取公开 URL。4 条分支最终合并为数组。

   运行提示词 · 来源原文。Gemini 2.5 Flash - Generate Image 2/3/4/5 节点的 Body 字段（raw JSON）；prompt1-prompt4 分别对应 4 个节点

   复制提示词

   ={"prompt":"{{ $('Set Storyboard Vars').item.json.prompt1 }}","image_urls":["{{ $('Upload Original Image to imgbb').item.json.data.url }}"],"num_images":{{ $('Set APIs Vars').item.json.number_of_images }}}

   运行提示词 · 来源原文。Rename to photo 2 节点 JS Code（photo3/4/5 同理）

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   return items.map((i)=>({json:{url: i.json.url},binary:{photo2:i.binary.data}}));

4. 生成社媒推广文案

   4 张图的 imgbb URL 经 Merge + Aggregate 聚合后，传入「Generate Carousel Description」OpenAI 节点。该节点使用 GPT-4.1，根据 4 个 prompt 生成 ≤150 字符的 Instagram/TikTok 推广文案，语言跟随输入描述语言。

   运行提示词 · 来源原文。Generate Carousel Description 节点的 System Message 字段

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   You are an expert at creating descriptions for Instagram/TikTok carousels.

   运行提示词 · 来源原文。Generate Carousel Description 节点的 User Message 字段

   复制提示词

   =I'm going to upload a carousel of 4 promotional images of a PRODUCT (9:16). Create an advertising description for Instagram/TikTok based on these prompts:
   1) {{ $('Set Storyboard Vars').item.json.prompt1 }}
   2) {{ $('Set Storyboard Vars').item.json.prompt2 }}
   3) {{ $('Set Storyboard Vars').item.json.prompt3 }}
   4) {{ $('Set Storyboard Vars').item.json.prompt4 }}
   
   IMPORTANT: Respond only with the description (≤ 150 characters), benefit-oriented with a strong CTA. If the prompts are in Spanish, respond in Spanish; if in English, respond in English.

5. 可选：自动发布到社媒平台

   若已配置 upload-post.com 凭证，「Upload Post」节点将 4 张 imgbb 图 URL 与 AI 生成的文案组合，自动发布到 Instagram、TikTok、YouTube、Facebook。需在节点参数中填写 upload-post.com 用户名、Facebook Page ID 等信息。注意：源模板已把该节点直接连在文案节点之后，并非默认关闭，手动运行也可能发布；首次测试前务必先停用或断开该节点，确认图片与文案后再接回。

本模板为 n8n 官方工作流。搭建前请确认已准备：fal.ai API token、imgbb API key、OpenAI API key；可选 upload-post.com 账号与 Instagram 商业账号。将模板导入 n8n 后，按上述步骤配置各节点凭证与变量，测试时先用单张产品图与简短描述验证故事板输出与图像生成链路。