Double-line vertical lifting device for building

The invention provides a double-line vertical lifting device for a building. The double-line vertical lifting device comprises a motor, a gear set and a rope winding drum. The rope winding drum is provided with two drum parts, the motor drives the rope winding drum to rotate through the gear set, and particularly, the rope winding device further comprises a winding displacement device and a transmission mechanism; the traverse unit comprises a traverse unit main body, a reciprocating screw rod and a polished rod; a wire arranging groove is formed in the top of each wire arranging device body, a vertical pulley is arranged on the rear portion of each wire arranging groove, two transverse pulleys are arranged on the two sides of the front portion of each wire arranging groove, the two wire arranging device bodies are arranged on the two threaded lead screw portions, and the initial positions of the two wire arranging device bodies are located on the left-handed spiral groove and the right-handed spiral groove r