The invention discloses a three-section four-piece split guide sleeve structure for an oil cylinder. The three-section four-piece split guide sleeve structure comprises a guide sleeve, a cylinder cover and a gland which are arranged between an outer-cylinder inner wall and an inner-cylinder outer wall sequentially from inside to outside, the inner wall of each of the guide sleeve and the cylinder cover is provided with a guide ring, the cylinder cover and the outer-cylinder inner wall of are connected through a rectangular thread, a three-piece clamping ring is arranged on the outer-cylinder inner wall at an outer port of the cylinder cover, the inner wall of the guide sleeve is provided with a guide sleeve movable seal while the outer wall of the same is provided with a guide sleeve static seal, a dustproof O-shaped ring is arranged at a position, close to the clamping ring, of the outer wall of the gland, a dustproof sealing ring is arranged at a position, close to the outer port, of the inner wall of the gland, and a cylinder mouth dustproof ring is arranged between a convex edge of the outer port of the gland and a cylinder mouth of an outer cylinder. The three-section four-piece split guide sleeve structure is reliable in structure, complete in function and convenient to maintain.