Paper cutter is a practical tool for cultivating manual and geometric operation skills. It is mostly a small manual model with a graduated line on the body to assist in precise cutting. In teaching, it can be used in conjunction with geometry teaching to cut large sheets of paper, create flat models such as squares and rectangles, and understand the relationship between the side lengths of graphics; In fraction teaching, cut the paper evenly and visually present the concepts of fractions such as 1/2 and 1/4. Its operation is simple and safe, and it can integrate mathematical measurement, geometric shapes and other knowledge into practical operation. It is an auxiliary tool for interdisciplinary teaching of primary school handicrafts and mathematics.