The invention discloses a robot for power transmission line inspection. The robot comprises a front robot body, a middle robot body and a back robot body, wherein the front robot body comprises a front arm and a front body; the middle robot body comprises a middle arm and a middle body; the back robot body comprises a back arm and a back body; the front arm, the middle arm and the back arm adopt the same structure; the front arm comprises a walking mechanism, a clamping mechanism, a clamping mechanism guide rail, a lifting mechanism and an arm rotating mechanism; the walking mechanism is fixedly mounted at the top end of the clamping mechanism guide rail; the clamping mechanism is glidingly mounted in a position, corresponding to the position of the walking mechanism, on the clamping mechanism guide rail; the bottom end of the clamping mechanism guide rail is fixedly mounted at the top end of the lifting mechanism; the bottom end of the lifting mechanism is rotationally mounted on the front body through the arm rotating mechanism; the front body and the middle body are movably connected through a front turning mechanism; and the middle body and the back body are movably connected through a back turning mechanism. The robot is applicable to the power transmission line inspection.