The invention provides an assembling type automatic assembling platform for a building. The assembling type automatic assembling platform for the building comprises a steel frame, supporting columns and a hydraulic lifting device; the steel frame is of a rectangular shape; the supporting columns are installed on the hydraulic lifting device, and the four supporting columns are installed at the four corners of the steel frame; two fixing trusses are installed on the lower side of the steel frame; the fixing trusses are of an I-shaped steel structure, and the two fixing trusses are in parallel; two horizontal transporting trusses are installed under the two fixing trusses; a short truss is further installed below the steel frame; and a vertical transporting device is installed below the short truss and fixed to the steel frame through four connecting rods. The assembling type automatic assembling platform for the building has the beneficial effects that the hoisting work of assembling type prefabricated parts for the building can be efficiently and precisely completed, and the problems that a traditional hoisting construction method is low in efficiency and high in energy consumption in the construction process are solved.