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In order to avoid the large deviation between the robot's traveling posture on slope and that on flat terrain, and to ensure the stability of the multi joint robot's motion, an automatic attitude control method of multi joint robot based on Laser radar is studied. Combined with the laser radar positioning and navigation technology, the CPG unit oscillator model is constructed, and the foot structure parameters are optimized according to the motion gait generation principle, and the motion posture parameters of the multi joint robot are set. According to the result of attitude parameter setting, the motion coordinate conversion is realized, and the nonlinear coupling term parameterization processing result is determined by using the simplification and decomposition expression of the dynamic equation. The feedback controller connection closed loop is established by integrating the obtained variable data, and the multi joint robot attitude is automatically controlled by the feedback controller connection closed loop. The comparative experimental results show that under the action of lidar technology, the maximum error between the steps of up and down slope of the robot and the step of flat straight travel is only 10%, the robot will not appear obvious shaking in the process of traveling, and the motion stability of the multi joint robot is high.