Embodiments of the present disclosure provide a plastic robot arm link. The robot arm link comprises a body made of plastic material; a connection arranged on the body and adapted to be coupled to a further plastic robot arm link or a transmission part of the robot; and an insertion made of material with a higher strength or stiffness than the plastic material and embedded in the body and/or the connection. By embedding the material with higher strength or stiffness within the body of the robot arm link made of plastic material, the stiffness and strength of the robot arm link can be enhanced. In addition, due to the presence of highly rigid materials, the creep effect of the plastic arm is also significantly reduced, improving the accuracy of the robot.