The invention discloses an exhaust valve for a water pump of a stirring pond. The exhaust valve comprises a shell, a floating bucket, a plug, a hydraulic cylinder, a temperature sensor, a pressure tank, a controller, a gas pressure sensor and a gas pressure tank. A containing cavity is formed in the shell and communicates with the water pump, and an exhaust opening is formed in the upper end of the shell. The floating bucket is arranged in the containing cavity. The plug is hinged to the exhaust opening and is hinged to the floating bucket through a connecting rod. The hydraulic cylinder is arranged above the shell, the control end of the hydraulic cylinder communicates with the containing cavity through a pipeline, and a piston rod of the hydraulic cylinder extends into the containing cavity and corresponds to the floating bucket. The temperature sensor is arranged in the containing cavity. Liquid heptafluoropropane is contained in the pressure tank, and a first solenoid valve is arranged at a gas outlet of the pressure tank. The controller is connected with the temperature sensor and the pressure tank. The gas pressure sensor is arranged in the containing cavity. Helium is contained in the gas pressure tank, a gas outlet of the gas pressure tank communicates with the containing cavity through a second solenoid valve, and the gas pressure sensor and the second solenoid valve are connected with the controller. The exhaust valve can exhaust gas of the water pump, and the work efficiency of the water pump can be improved.