Punching machine capable of switching punching shapes

The punching machine capable of switching the punching shapes comprises a machine table, vertical stand columns are installed on the two sides of the top of the machine table, a lifting plate capable of ascending and descending is further installed between the stand columns, a connecting column is fixedly installed at the bottom of the lifting plate, and an inner threaded sleeve is in threaded connection with the outer side of the butt joint position of the connecting column and a punching head. An annular gear is fixedly installed on the outer side of the inner threaded sleeve, and a first rotatable gear is further installed at the bottom of the lifting plate. The punching machine capable of switching the punching shapes is provided with an annular gear, a first gear, a connecting rod and a rotating plate, the annular gear is driven to rotate through rotation of the first gear, when the annular gear rotates, an inner threaded sleeve is driven to rotate, and the inner threaded sleeve can rise along a threaded