The invention discloses a watering device for crop new variety seedling cultivation. The watering device comprises a supporting plate and a control valve, the control valve is installed at the top ofthe supporting plate, a motor is installed at one side of the top of the supporting plate, a gear is installed on an output shaft of the motor, idler wheels are installed at one side of the supportingplate, multiple large nozzles and multiple small nozzles are installed at the bottom of the supporting plate, the control valve comprises a valve body and a valve pipe, the valve body is of a cavitystructure, a fixed iron core is installed on the inner wall of the top of the valve body, a winding roll is installed inside the valve body and is twined by a metal wire, the bottom of the winding roll is fixed to the inner wall of the bottom of the valve body, a spring is installed at the bottom of the fixed iron core, a movable iron core is installed at the bottom of the spring, the axis of thewinding roll is hollow, the fixed iron core, the spring and the movable iron core are all located in the hollow part of the winding roll, and the valve pipe is installed at the bottom of the valve body. The watering device is reasonable in structure and easy to operate, and watering different crops of different growth periods is achieved.