Movable large-span steel truss hoisting device

The utility model discloses a movable large-span steel truss hoisting device which comprises a portal frame and two guide rails arranged in parallel, the two guide rails are both used for being laid on a concrete ground, the portal frame comprises two supporting legs and a cross beam, the cross beam is provided with an electric hoist, a hook ring of the electric hoist is connected with a hoisting assembly, and the hoisting assembly is connected with the portal frame. The hoisting assembly is used for being connected with a large-span steel truss, the two supporting legs are fixed to the two ends of the cross beam in a one-to-one correspondence mode respectively, the bottoms of the two supporting legs are placed on the two guide rails respectively, a plurality of movable pulleys are installed at the bottoms of the supporting legs, the movable pulleys are all connected with the guide rails in a clamped mode, and the movable pulleys are connected with the cross beam in a clamped mode. The multiple movable pulley