The Solidworks software is used to analyze the statics and modal of the circular cutter and the straight blade knife. In the same test condition, the mass and volume wear tests of circular and straight-edged cutting tools were carried out, and the data of stress, strain, displacement and wear about the two kinds of shape cutting tools in the operation were obtained. Through comprehensive analysis, it is found that the straight blade flat cutter has less wear and better stability, and is more suitable for continuous mechanized cutting. The straight blade flat cutter is preferably selected as the main cutting tool of the bean curd stick cutting machine.