The invention discloses a B/S framework plugin-free universal video monitoring system, which comprises a display module, an acquisition module, a publishing module and a transcoding module, wherein the display module is used for displaying a real-time monitoring video flow on a webpage; the acquisition module is used for packaging an SDK (software development kit) provided by a video equipment manufacturer, requesting a real-time flow from video equipment and monitoring RTSP (real time streaming protocol) connection; the publishing module is used for storing video coding configuration information, buffering the video flow and processing a video checking request from a browser; the transcoding module is a bridge for connecting a coding conversion module with a flow media publishing module, is used for converting the RTSP flow into an HTTP (hyper text transport protocol) flow and realizing video coding conversion. According to the design of the invention, a video monitoring system is realized, the video equipment of different manufacturers is compatible, and the real-time monitoring video can be checked from the websites of various mainstream desktop terminals and mobile terminals without depending on any video playing plugins.