The invention discloses a distributed ultra-high-definition video synchronous processing method, which comprises the following steps of step 1, collecting video data in real time by a camera, converting the collection time into a uniform timestamp, and pushing a video stream to a client; step 2, the client reads and analyzes the video stream of each path of camera to obtain video frame data; step 3, decoding the video frame data by using a GPU (Graphic Processing Unit), and storing the decoded video frame data into a decoding cache queue; step 4, reading and processing the image from the corresponding decoding cache queue by each thread, and storing the image into a corresponding rendering cache queue; and step 5, reading the image data from each rendering buffer queue, synchronizing multiple paths of image data through uniform timestamp comparison, and merging the synchronized image sequences on the same canvas for rendering display. According to the method, video decoding and processing are carried out by using a GPU parallel calculation framework, the time delay and jitter of video processing are reduced, timestamp synchronization is integrated, and synchronous, real-time and smooth processing of distributed multi-channel ultra-high-definition videos is realized.