In order to achieve robot self-navigation, based on the inverse kinematics solution of D-H method, the navigation analysis of food material grabbing robot is carried out and the robot navigation positioning solutions were obtained. Through the combination of hardware and software of the robot, the automatic navigation control principle of the robot is described in the form of STL statement, realizing the robot positioning calculation. The efficiency and stability of robot navigation system are verified by practical production, which proves that it was well suited to food material grabbing production line.