The cast iron lifting regulating weir gate is composed of valve frame, weir plate, screw rod, guide rail and hoist. The hoist drives the screw rod to move up and down to change the water level difference between the weir gate and the liquid level, so as to change the water level and regulate the flow. The equipment is made of high-quality gray cast iron, with bronze alloy sealing surface on the mouth frame, which is directly connected with the hoist. It is characterized by simple structure, good water stop, wide adjustment range, convenient maintenance and management. It is suitable for irrigation, waterworks, flood prevention, sewage treatment and other industries to regulate the water level of the pool or control the flow of the channel.