The invention relates to a composite punch for a multipoint forming die, which comprises a punch rod with a square cross section and a round head. An axial communicating groove is formed on the outer edge of each side of the punch rod, the axle center of the punch hole is a through hole, two stepped holes are formed at two ends of the through hole, a thread bush is arranged inside the stepped hole at one end of the punch rod, a support screw is screwed into the thread bush, two holes equipped with induced steel magnets are formed on the outer surface of the thread bush, and the other end of the punch rod is connected with the round head; the round head has four planes same as those of the punch rod at the edges thereof, one end surface of the round head is a semispherical surface, the other end surface of the round head is a flat surface, a hollow shaft corresponding to the stepped holes of the punch rod is arranged at the center of the flat surface, two pins are arranged on the diagonal planes on the two sides of the hollow shaft, and a groove is formed on the surface on each side of the hollow shaft. The round head is made of a metal material, and the outer surface of the semispherical surface of the round head is wrapped by engineering plastics. The main body of the punch rod is made of an aluminum alloy material, and the copper alloy thread bush is embedded inside the stepped hole.