In order to solve the problems in duck slaughter machinery process, including low level of automation and low production efficiency, an automatic eviscerating machine was researched and designed. Moreover, the machine structure and its working principle were analyzed. The key components of the manipulator unit were analyzed, designed in coordination and corrected its cam curves based on the related theory of cam. Creo3.0 was used to establish the three-dimensional model of multiple trails cylindrical cam, and the kinematics simulation was analyzed in the software at the same time, to support the cam. Spindle was analyzed and rigidity check. The test results showed that under different production, the average integrity rate of number of internal organs was 94.5%, and the average morphological integrity was 91.06%.