Abstract: The present invention discloses a method of video coding conversion, which includes: decoding a video frame of the first coding mode into an image of standard intermediate format while determining whether the video frame is a reference frame or prediction frame and recording the recognition result; coding the image of standard intermediate format into a video frame of the second coding mode. The present invention also discloses a video coding conversion device using the method. By using the method and device for video coding conversion in accordance with the present invention, it can be implemented to recode the images based on the types of the video frames of the original coding mode during video coding conversion so as to avoid image errors caused by recoding large numbers of prediction frames of the original coding mode into reference frames of the new coding mode, therefore the video image quality after recoding is greatly improved.