Fire hydrant monitoring method and device and fire hydrant fault prompting method and device

The fire hydrant fault prompting device comprises a fire hydrant body and a water inlet pipe arranged at the lower end of the fire hydrant body and used for supplying water to the fire hydrant body. The fire hydrant further comprises a fire hydrant monitoring device arranged in the water inlet pipe, a lifting ring arranged in the water inlet pipe in a lifting mode, a control device arranged between the lifting ring and the water inlet pipe, and a collecting and processing unit arranged outside the water inlet pipe. The lifting ring ascends upwards to abut against the lower end of the fire hydrant monitoring device, when the lower end of the fire hydrant monitoring device is driven by external force, the driving pressure of the lower end can be monitored, monitored data are collected through the collecting and processing unit, and the collected data are prompted. And personnel can be timely arranged for handling when the water pressure changes, and a specially-assigned person does not need to be regularly arra