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Aiming at the problem of poor control performance and unstable working process of robot actuator control technology, a new high precision digital control technology is studied by introducing Vision Card. At the same time, the working principle of Vision Card and the control principle of robot rudder are analyzed, and the two principles are integrated to complete the control of the rudder from the visual angle. The DC motor, driver and feedback potentiometer are controlled respectively. By calculating the transfer function of the DC motor, the voltage on the feedback potentiometer and the total stroke, the pulse width modulation (PWM) electric pulse is obtained, and the obtained electric pulse is used to control the steering gear. In order to verify the effectiveness of the control technology, the experimental comparison with traditional open-loop control technology, PID control technology and fuzzy-PID control technology shows that the control technology studied has high stability and good control performance, which can effectively improve the efficiency of the robot rudder and ensure the quality of the robot rudder.