The invention discloses an intelligent monitoring system for the low-voltage transformer substation of a railway station. The intelligent monitoring system comprises a remote monitoring device, a reactive compensation controller, a remote control device, a remote detecting device, a remote communication device, an intelligent meter, a field bus, a protocol converter and a field device, wherein the protocol converter is connected to the master station of a monitoring center by the Ethernet; the remote monitoring device, the reactive compensation controller, the remote control device, the remote detecting device, the remote communication device and the intelligent meter are all connected to the protocol converter by the field bus; the remote monitoring device, the reactive compensation controller, the remote control device, the remote detecting device, the remote communication device and the intelligent meter are also connected to the field device. The intelligent monitoring system achieves the data concentration task of all controllers on the scene, sends data to the superior master station, accepts the control command of the superior master station, distributes to the corresponding controller to execute the control task, provides the function of human-computer interface when necessary to provide interaction service for operators on duty so as to execute the monitoring task locally, and provides a data interface for a FAS (Fire Alarm System).