Positioning tool for quickly mounting post-cast strip water stop steel plate and mounting method of positioning tool

The invention belongs to the technical field of building construction, and particularly relates to a positioning tool for quickly mounting a post-cast strip water stop steel plate and a mounting method of the positioning tool. Comprising a waterstop steel plate, steel bar positioning pieces, screws and steel bar fixing pieces. One end of the water stop steel plate extends into the shear wall, reinforcing steel bar positioning pieces are welded to the two sides of the end, extending out of the shear wall, of the water stop steel plate, screws are connected to the reinforcing steel bar positioning pieces, and reinforcing steel bar fixing pieces used for clamping concrete reserved reinforcing steel bars are connected to the tail ends of the screws; in the post-cast strip installation process, operators are not needed for welding and positioning, waste of labor cost is effectively reduced, meanwhile, construction is easy and convenient, the operation speed of constructors is greatly increased, the water stop stee