The invention relates to a spent acid solution recovery device which comprises a storage tank, a supporting frame and a heating tank fixed at the top of the supporting frame. A heating device is mounted in the heating tank, a filling hole is fixed in the top of the heating tank, a cover covers the filling hole, a liquid outlet is fixed in the outer wall, close to the bottom, of the heating tank, acontrol valve is mounted at the liquid outlet, the outer wall, close to the top, of the heating tank is connected with an air outlet, an air inlet is fixed in the top of the heating tank, the air outlet is connected with an air pipe connected with the air inlet, and an electric air inlet device is fixed onto the outer wall, close to the top, of the heating tank. The spent acid solution recovery device has the advantage of convenience in use.