The utility model discloses a developing apparatus cleaning water pressure stabilising arrangement, including water container, connect the inlet tube on one side of water container, connect at the water container opposite side and be used for the outlet pipe, go out the water piping connection developing apparatus, set up the solenoid valve on the inlet tube, the solenoid valve is connected with the controller again, and upper portion sets up inflation absorption membrane in water container, absorbs epimembranal side at the inflation and sets up the sensor detection ware, and the sensor detection ware is connected with the controller. Adopting above -mentioned technical scheme, absorbing the membrane when the inflation and expand in limited time, the solenoid valve on the sensor detection ware control inlet tube is closed, stops to supply water to water container, absorbs the membrane when the inflation and shrinks down in limited time, and the solenoid valve on the sensor detection ware control inlet tube is opened, supply water to water container, like this the periodic duty guaranteed hydraulic stability, avoid influencing development liquid medicine. The utility model discloses simple structure, convenient and reliable, maneuverability is strong.