The invention relates to a mechanical device for recovering zinc from zinc dross. The mechanical device comprises a base, a flat car, a trolley track, a crank mechanism, a motor, an iron comb frame, an iron comb cantilever, a balance weight adjusting mechanism, a dross bucket and a zinc receiving bucket, wherein the flat car is arranged on the trolley track; the dross bucket is placed on the flat car; one end of the flat car is connected with the motor through the crank mechanism and a speed reducer; the iron comb cantilever is arranged above the iron comb frame; an iron comb tooth is arranged at one end of the iron comb cantilever; the balance weight adjusting mechanism is arranged at the other end of the iron comb cantilever. By adopting the device, the metal zinc can be recovered from the dross, the direct recovery rate of a zinc smelting process is improved, and the production cost is reduced.