The utility model belongs to the technical field of fire hydrants, and particularly relates to a fire hydrant with a detection mechanism, which comprises a fire hydrant body and a detection device, and the fire hydrant body comprises a hydrant body, a
valve seat, a valve rod, a valve clack, a water receiving channel and a
pressure release valve. The hydrant body is connected with the water receiving channel, the
valve seat is arranged in the hydrant body, one end of the valve rod is connected with the valve clack and used for driving the valve clack to be close to or away from the
valve seat, and the
pressure release valve is arranged on one side of the hydrant body and located above the valve seat. The detection device is arranged on one side of the fire hydrant body, one end of the detection device is connected to the water receiving channel, the other end of the detection device is connected to the hydrant body, and the valve seat and the
pressure release valve are located between the two connecting points. In the detection process, no
water flow is left on the ground, the
water flow is prevented from splashing to detection personnel or affecting roads, meanwhile, the specific
water flow condition in the detection device can be observed, the situation that a water receiving channel is only filled with gas is avoided, and the situation that the rescue progress is affected due to detection errors of a traditional pressure gauge is avoided.