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As for the problem that the efficiency of picking of naval orange is low，a kind of picking actuator with surrounding and swallowing is designed，whose structure of implement is mainly consisted of multiplex slider rocker mechanism.Firstly，structure sketch of that installation is completed by referring to the operating principle of actuator designed，and the analysis of kinematics and dynamics is carried out.Then，the mathematical model of objective function is established based on the least consuming time，the optimized size of related structure are got by utilizing the Matlab software.Finally，based on the obtained dimension，the 3D model of end-effector is achieved，kinematics simulation is carried out by applying Adams software，the rationality and feasibility of design of actuator for naval orange harvesting is verified，and the theoretical support for the practical picking experiment is provided.