Door frame assembly positioning and mounting device based on constructional engineering

The utility model discloses a door frame assembly positioning installation device based on constructional engineering, which comprises a lifting bearing mechanism, a lateral pressing mechanism, a top frame positioning mechanism and a side frame positioning mechanism, and the top frame positioning mechanism comprises a first bolt mechanism and a first socket body; a positioning notch is formed in the upper end face of a top frame of the door frame assembly, meanwhile, a first socket body protruding downwards is arranged on an upper wall body, and the first socket body is correspondingly inserted into the positioning notch. The top frame of the door frame assembly is further provided with an extrusion groove, the extrusion groove is located on the side of the positioning notch and communicated with the positioning notch, and the first plug pin mechanism is installed in the extrusion groove and matched with the first socket body to be locked and positioned through the telescopic function. The problems that the d