The invention discloses a public security edge gateway system which comprises a basic management subsystem, a video access subsystem, a picture quality detection subsystem and a central management subsystem. The basic management subsystem is used for channel configuration management, image quality detection configuration, video real-time preview, video playback check, alarm query and network configuration; the video access subsystem is used for accessing videos of front-end equipment and accessing and converging videos of edge nodes; the picture quality detection subsystem is used for detecting video quality and analyzing and detecting picture abnormity in real time; and the central management subsystem is used for acquiring channel information and running states of all the edge nodes, previewing, playing back and downloading a monitoring video of the front-end access equipment, and upgrading and maintaining the network edge nodes. According to the invention, an edge and center combined access scheme is used, front-end equipment access is unified at the edge nodes, protocol conversion is carried out, automatic operation and maintenance of the video monitoring equipment are realized, and the manual operation and maintenance cost is remarkably reduced.