Pulley device for building

The invention discloses a pulley device for a building, which belongs to the technical field of building auxiliary equipment. A pulley supporting frame body and a pulley supporting frame base can slide to fold and unfold; a folded pulley structure is smaller in size, so that the pulley structure can be conveniently recycled into a protective shell, and therefore, an equipment size is greatly shortened, and equipment carrying and transporting is convenient; a bottom plate arranged defines triangular support through a supporting folding plate, so that the supporting folding plate is lifted to support the protective shell, and therefore, equipment stability is improved; moreover, the pulley device can be folded into the protective shell, so that transporting and carrying convenience of the equipment is improved; a movable pulley rack lock catch is convenient for dismounting a movable pulley rack, and is fixed while not used, so that damages caused by drop are avoided; and a hand-lifting handle is arranged for li