Crank rocker mechanism is a common mechanism, widely used in sewing machine, mixer, shaper and other equipment. Structure analysis and Mathematical modeling were carried out on the working device of mechanism, then, based on software ADAMS, the simulation model of the crank rocker mechanism is established to carry out the kinematics simulation analysis. Through analysis, we can get the kinematics characteristics of each rod of crank rocker mechanism, and can well predict the performance of mechanism. The research method of this paper can provide a reference for the research of movement precision and mechanical design for the mechanism.