Installation device and installation method for elevator shaft guide rail

The invention discloses a mounting device and method for an elevator shaft guide rail. The mounting device comprises a mounting platform, a transportation assembly and a hoisting assembly. The mounting platform comprises a first platform, a second platform and a connecting column, two ends of the connecting column are fixedly connected with the first platform and the second platform respectively, and two through holes are formed in the first platform; the transportation assembly comprises a first lifting part and a second lifting part, the output end of the first lifting part and the output end of the second lifting part are wound with a first cable and a second cable correspondingly, and the first cable and the second cable penetrate through the two through holes correspondingly and are detachably connected with at least two to-be-installed guide rails located on the bottom face of the elevator shaft; the hoisting assembly comprises a hoisting piece, a third cable is wound around the output end of the hoisti