The invention discloses a rebar connector for butt joint of prefabricated concrete members and a butt joint method. The rebar connector is composed of a retaining nut, a hook-shaped lock, a string ring, a butterfly-shaped supporting plate and a screw lock connection rod. When a groove in the middle of the screw lock connection rod is buckled and the hook-shaped lock in a connection sleeve are buckled together, rebars of the two prefabricated concrete members are connected. Liquid high-strength binding agents are poured into the sleeve where the rebar connector is placed, the redundant binding agents overflow; and after the screw lock connection rod is inserted, and the screw lock connection rod and the sleeve are bonded into a whole after the binding agents are solidified,. Meanwhile, concrete on the connecting surfaces are also bonded through binding agents, and the problems that time for operation, such as welding, overlap joint, bolting and the like, of traditional connection end plates is long, connector cost is high, and connector strength is unreliable, are solved. According to the rebar connector for butt joint of the prefabricated concrete members and the butt joint method, construction operability is high, the member assembly degree is high, construction operation efficiency is high, engineering materials are saved, engineering cost is low, and the engineering implementation effect is good.