Pad structure of sucking disc

A pad structure of a sucking disc, comprising a main body made of soft material, wherein the main body has an axial surface, a suction surface, and a peripheral surface, the axial surface is provided for being pressed by a pressing member of the sucking disc, the suction surface is provided for sucking on a target object, wherein the axial surface comprises a lifting portion and a pressure bearing block which is hard and circular shaped, the portion of the main body between the lifting portion and the pressure bearing block is defined as a deformable portion, the portion of the main body below the pressure bearing block is defined as an undeformable portion, the undeformable portion is located at the outer periphery of the main body, the deformable portion is located between the lifting portion and the undeformable portion, wherein when the lifting portion is forced, the deformable portion is lifted and deformed, and the pressure bearing block is fixedly combined with the undeformable portion, the hardness characteristic of the pressing bearing block maintains the shape of the outer periphery of the main body to allow a bottom surface of the undeformable portion keeps flat, so that the undeformable is firmly and flatly attached onto the target object.