An intelligent low-voltage network comprehensive protection device comprises a moulded case circuit breaker, a power circuit, a leakage analog circuit, a leakage detection circuit, a leakage amplifying circuit, an over/under-voltage sampling comparison circuit, an overcurrent sampling comparison circuit, a tripping operating value parameter adjustment setting circuit, a singlechip U4, a liquid crystal display circuit, an action state alarm circuit, a 485 communication interface and an electric switching on and off control circuit. The device not only has the functions of protecting earth fault, leakage tracking, overload, short circuit, overvoltage, undervoltage, faulted neutral line and the like, but also has the comprehensive function of adjusting the leakage operating values and actuation time, overvoltage and undervoltage operating values, overcurrent operating value and the like in a multi-switching manner, also has the functions of displaying voltage, current, leakage and other data and failure alarming, and further has the network systematic management function of telemetering, telecommunication, remote control and other low-voltage networks.