To provide a hydraulic wheel structure capable of easily changing a tire and preventing theft.

The hydraulic wheel structure comprises a disk tightened to a drive shaft and having a first cylinder and a second cylinder which are communicated with each other and filled with fluid, respectively, a first piston to be movably inserted in the first cylinder, a tire wheel to be tightened to the disk, a tire to be coupled with the tire wheel, an attachable/detachable button which is movably provided on the tire wheel and capable of moving the first piston in response to the movement, and a wheel fixing member which is provided on the disk, integrated with a second piston movable provided inside the second cylinder so as to be moved along the direction set corresponding to the pressure of the fluid inside the second cylinder, elastically supported by an elastic member in the direction opposite to the set direction, and capable of being selectively tightened to the tire wheel in response to the movement.