Objective To integrate the CAD technology into the design of crank-rocker mechanism in packaging machinery. Methods Based on the illustration of design formula for crank rocker mechanism, SolidWorks software was used to solve, analyze and simulate this type of mechanism through case study. Results The accuracy of this design method reached 8 decimals,and the analysis and simulation results could be used to guide the design. Conclusion This method was simple, practical and highly accurate, which solved the problems in the design and simulation of such mechanisms.