The invention mainly discloses a high-precision small storage robot applicable to large space carrying. The robot comprises a walking mechanism, a transmission mechanism and an execution mechanism, the transmission mechanism comprises a base, a rotating platform and a transmission arm, the base is fixed to the walking mechanism, a support arm is arranged on the upper portion of the base, the upperend of the support arm is rotationally connected with the rotating platform which is internally provided with a lifting device, the lifting device is connected with the transmission arm which is internally provided with a telescopic device, the telescopic device is connected with the execution device, the base is internally provided with a rotating device which is connected with the rotating platform, and the rotating device drives the rotating platform, the transmission arm and the execution mechanism to rotate on the horizontal plane. Accordingly, the structure is simple, stable and compact, the occupied area is small, the degree of freedom is high, rotation is flexible, the motion precision is improved, the motion range is expanded, and the use cost is lowered.