With the continuous development of digital information technology, the monitoring system has become the important application in the field of various industries. With the development of wireless technology such as WiFi, it is able to realize the wireless transmission of video data, because of its unique convenience it will replace the traditional cable monitoring system. Image mosaicing is a popular image processing technology, which means spicing two or more images with overlapped area into a seamless high-resolution image. This paper combines the advantage of WiFi wireless technology with the advantage of image splicing technology. It proposes the distributed monitoring scene mosaics system based on WiFi. This system makes multiple clients can transmit the collected images through WiFi network to the server, the server process the transmitted image by using SIFT algorithm and RANSAC algorithm to complete mosaicing. Finally, we achieve wide scene monitoring. The experimental results show that the system can effectively realize monitoring scene mosaicing.