The utility model provides a take special supplementary support rod assembly of prefabricated wallboard of door opening, includes that generous pipe, one end embolias xiao fang's pipe of generous pipe, manages one end welded fastening's steel sheet B with generous tub of one end welded fastening's steel sheet A with xiao fang, all bored a plurality of screw rod hole on steel sheet A and the steel sheet B, every screw rod is downthehole fixes a sleeve with the screw rod, and the sleeve is pre -buried in taking the prefabricated wallboard of door opening, and generous pipe passes through the bolt and nut fixed connection location with the suit overlay segment of xiao fang's pipe. The utility model discloses can effectively avoid taking door opening prefabricated component to put hoist and mount and the damage of transit appearance fracture into production, guarantee building quality and construction progress, simultaneously, this subassembly simple structure installs convenient to use, and the commonality is good, reliable operation, repeatedly usable, reduce cost.