The invention provides a distributed power grid-connected monitoring system based on a B/S architecture, and belongs to the field of distributed power monitoring systems. The system comprises a physical equipment layer, a Web function layer, and a Web monitoring layer, wherein the physical equipment layer comprises a grid-connected point disconnecting switch, a circuit breaker, and control equipment. The control equipment is connected to an electric operation connection point of the disconnecting switch and the circuit breaker, and achieves the automatic control and remote control of the circuit breaker and the disconnecting switch. The system also comprises an island detection unit which is used for disconnecting a distributed power supply when a fault happens to a main grid. Through a conventional Ethernet, the system employs a direct access to an intelligent terminal from a browser, saves a monitoring main station, a substation and a dedicated communication network, and guarantees the flexibility and economic performance of the system.