Protection box for track circuit of railway signal system

The utility model discloses a protection box for track circuit of railway signal system, including work main part, power element, expanding spring, drop -down round and casing, base, work pilot lamp and information acquisition device are installed to the surperficial top of casing, and work pilot lamp and information acquisition device and lie in the both sides of base, go up the base upper end and install the transmission line, power element is installed to casing one side, power element passes through the automatically controlled unit of PLC and links to each other with the controller, the inside top at the casing is installed to the work main part, install the supporting seat in the work main part, the conduction frame is installed at the supporting seat center, the transmission coil is installed to conduction frame one end, the internally mounted of casing has positive and negative magnet, the cutting trochus is installed to the bottom of casing, tension wire installs the expansion bracket in the center.