The utility model provides a novel planar envelope worm reducer lifting device. A main body bracket is connected with a directional operating lever by virtue of a rotating bearing; a reversible switch, a motor and a worm reducer are arranged on the directional operating lever from the left to right; the reversible switch is connected with the motor; the motor is connected with the worm reducer; the worm reducer is connected with a steel wire rope by virtue of a power output shaft; and the steel wire rope is connected with a lifting hook. The novel planar envelope worm reducer lifting device disclosed by the utility model is low in manufacturing cost, convenient to mount, low in failure rate and convenient to popularize and use; the problems that the conventional reducer is high in failure rate, low in bearing capability and high in maintenance cost are solved; a composite seamless steel tube is formed by compounding a titanium alloy tube on the inner wall of a steel tube, so that the corrosion resistance is improved, and due to a composite aluminum layer outside the seamless steel tube, not only is the corrosion resistance on the outer wall of a carbon steel tube guaranteed, also, heat dissipation ribs are conveniently drawn on the aluminum layer, the heat exchange performance of the heat exchange tube is improved, and the pressure resistance of the heat exchanger can be enhanced by virtue of the heat dissipation ribs.