The utility model provides a static pressure balance antifriction sliding supporting oil cylinder which comprises a cylinder body. A piston is installed in the cylinder body. A sliding shoe with a recessed portion recessed inwards at the bottom is installed at the outer end of a piston rod. A static pressure piston is installed in the recessed portion through a perpendicularly arranged spring. The cross sectional area of the recessed portion is slightly smaller than the area of the upper surface of the piston. A radial sealing ring is installed on a side wall of the static pressure piston and placed between the side wall of the static pressure piston and an inner wall of the recessed portion. A first penetrating hole is correspondingly formed in the middle of the piston and the piston rod along the radial direction. A second penetrating hole connected with the first penetrating hole in a communicating mode is formed in the sliding shoe. The first penetrating hole is communicated with an inner cavity of the cylinder body. The second penetrating hole penetrates the inner top face of the recessed portion. A third penetrating hole is formed in the static pressure piston. A bottom sealing ring is installed on an inner side wall at the lower end of the recessed portion and placed between the inner side wall at the lower end of the recessed portion and a side wall at the lower end of the static pressure piston. According to arrangement of the static pressure piston and the static pressure balance unloading principle, positive pressure of a friction pair and an actual equivalent friction coefficient are reduced, friction resistance is reduced and efficiency of transportation with heavy load in a sliding mode is improved.