Punching mechanism for steel pipe

The utility model relates to the technical field of steel pipe punching, in particular to a punching mechanism for a steel pipe, which comprises a strip-shaped support base and a punching mechanism, and the punching mechanism comprises a punching seat, an inner die core and a punching cutter; the punching seat is arranged at the end of the strip-shaped supporting base, a through groove is formed in the inner side end face and the outer side end face of the punching seat, the inner die core is composed of a round rod and a die core arranged at the end of the round rod, the round rod is horizontally positioned on the strip-shaped supporting base, and the die core extends into the through groove. A through groove is formed in the upper end face and the lower end face of the punching base, a gap allowing a punching section of a steel pipe to stretch into is formed between the outer wall of the die core and the inner wall of the through groove, a through punching groove is formed in the upper end face and the lowe