The invention discloses a fish skin of robot fish and the robot fish containing the same, and belongs to the technical field of underwater robots. The fish skin comprises a fish skin body, wherein the whole fish skin body is of a streamline structure, a plurality of grooves are formed in the side wall of the fish skin body and are distributed in parallel along the long axis direction of the fish skin body, and then the fish skin body forms a flexible telescopic structure; the robot fish contains the fish skin. The fish skin of the robot fish has the advantages that the whole fish skin still forms the streamline structure, so that the fluid drag is favorably reduced; by forming the grooves, a water drainage area is increased, the buoyancy of the robot fish is increased, and a plurality of carrying modules can be arranged in the robot fish; by forming the grooves in the side wall of the fish skin body, the compressive strength is increased under the condition of no change of a material, and the deformation amount of the robot fish under the water pressure action is reduced.