The invention provides a clamping mechanism for a transporting robot. The mechanism comprises a clamping supporting frame, a clamping driving mechanism, a supporting clamping arm and a rotary clampingmechanism, the rotary clamping mechanism is used for clamping a work piece, the clamping driving mechanism is arranged on the clamping supporting frame, the supporting clamping arm is arranged on theclamping supporting frame and used for bearing a work piece, the rotary clamping mechanism is arranged on the clamping supporting frame and is arranged above the bearing clamping arm, and the rotaryclamping mechanism is driven by the clamping driving mechanism to move in the horizontal direction. According to the clamping mechanism, a work piece can be tightly clamped under the action of the rotary clamping mechanism and the bearing clamping arm to allow the clamping mechanism to stably clamp an inner wall panel in the transportation process performed by the transporting robot.