The invention discloses a valve with a water leakage detecting function. The valve comprises a valve body, wherein flanges are mounted at two ends of the valve body; a protective shell is arranged onthe outer wall of the valve body in a sleeving manner; a water outlet is arranged on the protective shell; a humidity sensor is arranged on the inner wall of the protective shell; a baffle plate is arranged in the valve body; a rotating shaft is fixed at the middle of the baffle plate; the upper end of the rotating shaft is fixedly connected with the lower end of a screw rod; the top end of the screw rod penetrates through the valve body and the protective shell, extends to a position above the protective shell, and is fixedly connected with the bottom of a handle; the lower end of the rotating shaft penetrates through the valve body and the protective shell, and is fixedly connected with a rotating motor; the rotating motor is mounted on a mounting frame; the mounting frame is fixed withthe outer wall of the protective shell; a controller and an alarm are arranged on the outer wall of the protective shell; and the controller is electrically connected with the humidity sensor, the rotating motor and the alarm. The valve has the beneficial effects that the water flow rate can be automatically adjusted, whether water leaks or not can be detected in real time, the valve can be automatically closed, and working personnel can be notified in time.