Boiler steam drum water level water injection device

The utility model provides a boiler steam drum water level water injection device which comprises a water storing tank. One end of the water storing tank is connected with a water pump through a first rubber pipe, and the other end of the water storing tank is connected with a second rubber pipe. The second rubber pipe is connected to the bottom end of a U-shaped pipe through a three-way valve. A water injection valve is arranged on the second rubber pipe. Pipe openings of the two ends of the U-shaped pipe are respectively provided with a reference glass pipe and a balance pipe. The upper end of the balance pipe is connected with a balance container. The balance pipe is connected with a differential pressure transmitter. The portion, on the lower side of the differential pressure transmitter, of the balance pipe is further provided with a positive pressure side sewage draining door. The differential pressure transmitter is connected with the bottom of a boiler through a liquid phase pipe. The portion, on the