diff --git a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs
index a5f08e433..08d8cffc4 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs
@@ -54,15 +54,20 @@ async fn raw_extract_inner(
         .strip_prefix("data:")
         .and_then(|value| value.strip_suffix(";base64"))
         .unwrap_or("image/png");
-    if !mime.eq_ignore_ascii_case("image/png") {
-        return Err("图片分离请求只支持 PNG 源图".to_string());
-    }
+    let is_png = mime.eq_ignore_ascii_case("image/png");
     let image_bytes = base64::engine::general_purpose::STANDARD
         .decode(data.trim())
         .map_err(|error| format!("解码源图失败：{error}"))?;
     if image_bytes.is_empty() {
         return Err("源图不能为空".to_string());
     }
+    let image_bytes = if is_png {
+        image_bytes
+    } else {
+        tokio::task::spawn_blocking(move || normalize_source_image_to_png(image_bytes))
+            .await
+            .map_err(|error| format!("转换源图任务失败：{error}"))??
+    };
     let client = crate::http_client::agc_main_site_client_builder()
         .build()
         .map_err(|error| format!("创建图片编辑客户端失败：{error}"))?;
@@ -122,6 +127,35 @@ async fn raw_extract_inner(
     result
 }
 
+fn normalize_source_image_to_png(image_bytes: Vec<u8>) -> Result<Vec<u8>, String> {
+    let image = image::load_from_memory(&image_bytes)
+        .map_err(|error| format!("解码非 PNG 源图失败：{error}"))?;
+    let mut png_bytes = Vec::new();
+    image
+        .write_to(&mut Cursor::new(&mut png_bytes), image::ImageFormat::Png)
+        .map_err(|error| format!("将源图转换为 PNG 失败：{error}"))?;
+    Ok(png_bytes)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::normalize_source_image_to_png;
+    use image::{DynamicImage, ImageFormat, Rgb, RgbImage};
+    use std::io::Cursor;
+
+    #[test]
+    fn converts_jpeg_source_to_png() {
+        let image = DynamicImage::ImageRgb8(RgbImage::from_pixel(2, 2, Rgb([255, 0, 0])));
+        let mut jpeg = Vec::new();
+        image
+            .write_to(&mut Cursor::new(&mut jpeg), ImageFormat::Jpeg)
+            .expect("encode jpeg");
+
+        let png = normalize_source_image_to_png(jpeg).expect("convert jpeg");
+        assert_eq!(&png[..8], b"\x89PNG\r\n\x1a\n");
+    }
+}
+
 pub(super) async fn write_processed_image(
     processed_url: String,
     target: PathBuf,