Building external wall waterproof performance detection device

The utility model discloses a building external wall waterproof performance detection device, which comprises a support frame I and a water storage tank arranged on the support frame, a drain pipe is fixedly connected to the bottom of the water storage tank, a water suction pump I is arranged on the side wall of the water storage tank, and one end of the drain pipe far away from the water storage tank is connected with the water suction pump I; a water conveying pipe is installed at the water outlet end of the first water suction pump, a spraying pipe is installed at the end, away from the first water suction pump, of the water conveying pipe, a plurality of spraying heads are installed on the spraying pipe, second supporting frames are symmetrically fixed to the first supporting frame, electric push rods are fixed to the second supporting frames, semi-arc-shaped plates are fixed to push rods of the electric push rods, and the spraying pipe is installed on the semi-arc-shaped plates; the front end of the firs