The QTC402 fire hydrant smart cover can intelligently detect the water discharge status and facility status of the fire hydrant without changing the original fire hydrant structure, and remotely transmit information such as water discharge alarm and facility damage to the centralized control center through NB-IoT, realizing the concentration of fire hydrants Supervision. The fire hydrant smart cover has the characteristics of easy implementation, no wiring, stable work, and easy maintenance. It can directly replace the 100mm cover of the original ordinary fire hydrant, and the product has strong adaptability. The main functions of the fire hydrant supervision platform include fire hydrant registration, fire hydrant management, water discharge alarm, open cover alarm, knock down alarm, damage alarm, user management and other functions.