Robot arm link (100) comprises a body made of non-metallic material, a transmission cable (102) made of conducive material and embedded within the body (101), and at least one connector (103) arranged on the body (101) and coupled to the transmission cable (102), each connector (103) adapted to be electrically connected to a connector (1031) of a further robot arm link (1001) of a same specification, a sensor (301), or a power source (302) of the robot (200). By embedding the transmission cable (102) within the non-metallic material to form the robot arm link (100), there is no need to consider how to route the cable (102) and thus the difficulty of cable routing design can be significantly reduced. Furthermore, the efficiency of robot assembly and maintenance can be increased accordingly. In addition, the cables (102) arranged in the robot arm links (101) are not easily damaged, thereby increasing the service life of the robot.