Prefabricated steel structure building installation construction device

The invention discloses a prefabricated steel structure building installation construction device which comprises a square steel pipe column and an L-shaped base plate, the L-shaped base plate is provided with a fastening assembly, the fastening assembly is composed of a bolt and a nut, the bolt is provided with a locking assembly, and the locking assembly comprises a sliding block A, a sliding block B, a connecting rod, a lantern ring, a sliding ring, a telescopic rod, a driven part and a spring D; two sets of lantern rings, two sets of sliding rings, two sets of telescopic rods and two sets of driven pieces are arranged, and one set of lantern rings, sliding rings, telescopic rods and driven pieces are arranged on the surface of the sliding block A. By means of the fastening assembly, the locking assembly and the limiting assembly, after the steel plate is installed, the sliding block A and the sliding block B are installed on the bolt, a lantern ring is pushed, the sliding block A and the sliding block B c