The invention discloses a security monitoring system for railway trackside electromechanical signal equipment. The system is an operation platform of a security monitoring device and comprises a vehicle body external high-speed camera system, a power supply system, a data transmission system, a data storage system, a data processing system, a real-time display system, an alarm system, a fault-freeequipment sample library, an image processing algorithm module, a fault database, a remote monitoring module, a server and a kilometer post positioning module. The security monitoring system for theelectromechanical signal equipment along the railway track can rapidly capture and photograph the railway and the electromechanical signal equipment on the two sides of the railway and compare the captured and photographed electromechanical signal equipment with the intact equipment state in the database, so that equipment with problems is found, and related departments are informed to process ormaintain the equipment. The display system uses software for imaging display, and can be used for calling the camera at any time and selectively viewing the stored video. According to the system, thesafety management of trackside equipment is further improved, and the operation cost is reduced.