Abstract: A layer piercing paper punch is disclosed, in which a plurality of cutting hole plates is provided on a base between the location of a cutting hole and an upper cutter bar for perforation. Each of the cutting hole plates has a sharp-pointed portion on the front end and a cutting hole near the middle part. The cutting hole plates lying parallel to the surface of the base and in an overlapping position are always maintained by a position-fixing member with cutting holes in alignment with the upper cutter bar and the lower cutting hole on the base thereby enabling the cutting hole plates to perform up and down movement without any movement on the sides during the perforation of a paper file.