Energy-saving building ventilation device

The utility model discloses an energy-saving building ventilation device which comprises a fixing frame, an external connection port is fixedly installed on the rear surface of the fixing frame, a dustproof net is fixedly installed at the position, close to the edge of the front surface, in the fixing frame, and a motor fixing groove is formed in the rear surface of the fixing frame. And a limiting groove is formed in the inner wall of the motor fixing groove, a fixing arc-shaped block is movably installed in the limiting groove, and a motor fixing plate is movably installed in the motor fixing groove. The fixed arc-shaped block can be driven to move by moving the displacement handle, and when the fixed arc-shaped block moves towards one end of the limiting groove, the fixed arc-shaped block can move out of the motor fixing groove, so that limitation on the motor fixing plate is relieved, the motor fixing plate can be easily taken out at the moment, and later maintenance and overhaul of the motor are facilita