Abstract: The knife rest in the cutting and crushing device is an important bearing part in the straw cutting square baler, which impacts the performance of the straw cutting square baler. In order to avoid the problem of insufficient structural strength and resonance of the turret during the operation, a three-dimensional model of the straw cutting square baler was established by using SolidWorks software, and the simplified turret model was imported into ANSYS Workbench software for static and modal analysis. The static analysis results showed that the maximum displacement and stress of the tool holder under static load were 0.259 3 mm and 54.77 MPa, which were less than the yield strength limit of Q345. The modal analysis results showed that the range of the first 20 natural frequencies of the cutter head was 32.61-257.83 Hz, which was different from the excitation frequency 0-15 Hz generated by the tractor, so the straw cutting square baler will not produce a resonance phenomenon during operation. The field test results showed that the pure working hour productivity of the straw cutting and kneading square baler was 4.49 t/h, the baling rate was 98.5%, the regular straw baling rate was 97.01%, and the fall resistance rate was 95.52%. The test indexes met the test requirements, and the comprehensive performance of the tool rest met the design requirements.