Water replenishing tank capable of avoiding overpressure protection misjudgment

The utility model discloses a water replenishing tank capable of avoiding overpressure protection misjudgment, and relates to the technical field of water replenishing tanks. The water tank comprises a water tank body and an installation plate, the upper end of the water tank body is in threaded connection with a sealing cover, the lower portion of one side face of the water tank body is fixedly communicated with a drainage pipe, a make-up pump is installed on the installation plate, a first pipeline is installed at the input end of the make-up pump, and a second pipeline is installed at the output end of the make-up pump. When water enters the water tank body through the make-up pump, the make-up pump is started, the pressure relief valve body is closed, when the make-up pump is closed and water feeding is stopped, the pressure relief valve body is opened, and the overpressure protection effect is achieved, that is, when the make-up pump works, overpressure protection is in a standby state, and when the make