In order to ensure that the main components of a sealing machine could work safely and reliably, the mechanical analysis of the parts was conducted. Using Ansys Workbench software to perform necessary static, dynamic and modal analysis for for some parts. The maximum stress and strain found by analysis were compared with the allowed stress and strain of the material, and the critical speed was compared with the actual speed. It was found by the analysis that the maximum stress was 2.0697 MPa, which was far less than the material yield limit of 355 MPa and the tensile strength of 600 MPa, while the actual speed was 396~1980 r/min, which was much smaller than the minimum value of the critical speed 27 330 r/min. In conclusion, the main components of the sealing machine were safe and reliable in operation.