Cavity-free steel auxiliary frame for aluminum alloy window

The utility model discloses a cavity-free steel auxiliary frame for an aluminum alloy window, which relates to the field of aluminum alloy windows and comprises a wall body, a steel auxiliary frame is embedded on the upper surface of the wall body and is made of a galvanized steel sheet, the galvanized steel sheet is of a bending structure, corrosion-resistant rubber is filled on the inner side of a bending part of the galvanized steel sheet, and the inner side of the bending part of the galvanized steel sheet is provided with a sealing ring. A welding seam is arranged at the bottom of one end, far away from the bent part, of the galvanized steel plate, the welding seam is formed in the wall body, and an anchoring steel bar is arranged in the welding seam and fixedly mounted at the bottom of one end, far away from the bent part, of the galvanized steel plate. The bent galvanized steel sheet is adopted to replace an original pressed steel frame, the structure is simple, the cost is low, the corrosion-resistant