Assembling device of cubic press

The invention relates to the technical field of top press assembling, and particularly discloses a cubic top press assembling device which comprises a support and a positioning mechanism, the support drives the positioning mechanism to be inserted into an assembling hole of a top press, the positioning mechanism comprises a positioning cylinder, a movable rod and a supporting assembly, a plurality of strip-shaped grooves are formed in the peripheral side of the positioning cylinder, the movable rod is movably arranged in the positioning cylinder, and the supporting assembly is arranged in the positioning cylinder. The support is provided with an extending air cylinder, the extending end of the extending air cylinder is connected with one end of the movable rod, the other end of the movable rod is detachably connected with the pin shaft, any supporting assembly comprises a supporting strip and two connecting rods, one ends of the two connecting rods are hinged to the movable rod and the positioning barrel resp