The embodiment of the invention provides a multi-channel video image real-time fusion method and device, and the method comprises the steps: storing a target pixel which is the pixel with the minimumcoordinate value in all paths of currently processed pixels, and enabling the coordinate value of the pixel to be obtained through the calculation according to the coordinate value of the pixel and apreset algorithm model; And if it is judged that the storage space corresponding to the coordinate value of the target pixel is full, fusing the pixels stored in the storage space. The embodiment of the invention provides a multi-channel video image real-time fusion method and device. multiple paths of high-definition video data can be cached in real time; According to the invention, the multi-channel video data is received and fused at the pixel level, and the fused data is sent out in real time, so that the problem that the processing speed and the real-time performance of the traditional embedded equipment are limited is effectively solved, and the video stream data is successfully cached and fused and transmitted on the basis of not limiting the transmission speed of the video stream data.