A movable bearing device comprising: a base ; a plurality of casters attached to a bottom of the base and protruded from the bottom of the base ; and a plurality of foot pads movably connected to the bottom of the base and movable relative to the base between a first position where bottom surfaces of the foot pads each have a height not higher than bottom edges of the casters , and a second position where the bottom surfaces of the foot pads each have a height higher than the bottom edges of the casters ; wherein each of the foot pads includes a pad body and a screw having a top end thereof inserted into one respective top hole and a bottom end thereof connected with one respective pad body ; wherein the device includes a top plate and a bottom plate , said bottom plate is mounted to a bottom surface of a support frame and provided with a plurality of bottom holes and a plurality of openings ; the screw of each of the foot pads passes through one respective bottom hole ; characterized in that the base includes a support frame having a plurality of threaded holes , and the top plate is disposed on a top surface of the support frame and having a plurality of top holes ; the screws of the casters are respectively screwed to the threaded holes such that the foot pads are movable relative to the base between the first position where the top ends of the screws are not protruded from the top holes and the bottom surfaces of the pad bodies each have a height not higher than the bottom edges of the casters , and the second position where the top ends of the screws are protruded from the top holes and the bottom surfaces of the pad bodies each have a height higher than the bottom edges of the casters ; wherein a part of each of the casters is received in one respective opening of the bottom plate . a base ; a plurality of casters attached to a bottom of the base and protruded from the bottom of the base ; and a plurality of foot pads movably connected to the bottom of the base and movable relative to the base between a first position where bottom surfaces of the foot pads each have a height not higher than bottom edges of the casters , and a second position where the bottom surfaces of the foot pads each have a height higher than the bottom edges of the casters ; wherein each of the foot pads includes a pad body and a screw having a top end thereof inserted into one respective top hole and a bottom end thereof connected with one respective pad body ; wherein the device includes a top plate and a bottom plate , said bottom plate is mounted to a bottom surface of a support frame and provided with a plurality of bottom holes and a plurality of openings ; the screw of each of the foot pads passes through one respective bottom hole ; characterized in that the base includes a support frame having a plurality of threaded holes , and the top plate is disposed on a top surface of the support frame and having a plurality of top holes ; the screws of the casters are respectively screwed to the threaded holes such that the foot pads are movable relative to the base between the first position where the top ends of the screws are not protruded from the top holes and the bottom surfaces of the pad bodies each have a height not higher than the bottom edges of the casters , and the second position where the top ends of the screws are protruded from the top holes and the bottom surfaces of the pad bodies each have a height higher than the bottom edges of the casters ; wherein a part of each of the casters is received in one respective opening of the bottom plate . <EOS>