The invention discloses a multi-set superposed type universal wrench for automatically adjusting the hole diameter and relates to a wrench. A wrench head (1) is arranged at one end of a handle (9) and provided with an inner hexagonal sleeve hole (2); the inner hexagonal sleeve hole of the wrench head is internally provided with an inner hexagonal sleeve ring (3); three spaced faces of six faces of the outer edge of the inner hexagonal sleeve ring are each provided with a long-strip groove (12); the inner hexagonal sleeve ring is located in the inner hexagonal sleeve hole of the wrench head; after three screws (8) penetrate three screw holes formed in the exterior face of the wrench head, the inner ends of the three screws are located in the three long-strip grooves of the inner hexagonal sleeve ring, and the inner hexagonal sleeve hole of the wrench head and an inner hexagonal sleeve hole of the inner hexagonal sleeve ring form two wrenches which are in different diameters and used for outer hexagonal bolts and nuts. According to the multi-set superposed type universal wrench for automatically adjusting the hole diameter, a hexagonal sleeve ring, the inner hexagonal sleeve ring and the wrench head are movably connected through the screws, and fast and adjustment-free bolt and nut assembly and disassembly operation is achieved.