The invention provides a robot motion path planning method. The robot comprises a host, a mechanical arm, a microcontroller and a camera, wherein the host is connected with the microcontroller, and the microcontroller is connected with a steering gear on the mechanical arm and is used for controlling the motion of the mechanical arm; the host is connected with the camera. A RGBD (Red Green Blue Depth) camera of the robot can shoot information in the captured range to realize the follow-up of the human body and the human arm; the degree of freedom and the degree of precision of the mechanical arm of the robot in the motion planning process can be improved, and are fused on time, space and data to improve the system adaptability and environmental space recognition ability, so that the robot moves in accordance with a correct planning trajectory, and thus the path planning of the mechanical arm of the robot can be realized at high degree of freedom, the work efficiency is high, and the computation amount is small.