The invention provides an electric control valve which comprises a valve body provided with a built-in valve element and an actuator component mounted on the valve body, wherein the actuator component comprises a control cabinet and a screw rod which vertically extends downwards out of the control cabinet, the lower end of the screw rod is connected with the valve element, the control cabinet is internally provided with a gear component which is engaged with the screw rod to transfer power to the screw rod, and a motor for providing power for the gear component, the gear component consists of a plurality of mutually-engaged gears, the control cabinet comprises a chassis and a cover body mounted on the chassis, and a window for manually adjusting the gear component and an adjusting button for controlling the motor are arranged on the cover body. The electric control valve disclosed by the invention is reliable in function and high in capability of resisting water and moisture.