The invention discloses a hinge pin structure of a track-type engineering machine. The hinge pin structure of the track-type engineering machine comprises a hinge pin body. A boss is arranged at one end of the hinge pin body. A through hole is formed in the hinge pin body, is located on the side away from the boss and is perpendicular to the center axis of the hinge pin body. An annular groove isformed in the hinge pin body and is located in the side, close to the boss, of the through hole. Oil grooves are formed in the side wall of the hinge pin body and are located in the annular groove. Aplurality of oil injection holes are formed in the surface of the end, away from the hinge pin body, of the boss and communicate with an oil storage cavity. The oil storage cavity is formed in the hinge pin body, is kept parallel to the center axis of the hinge pin body and communicates with the oil grooves through a plurality of oil outlets. The hinge pin structure is simple and reasonable in design, and a hinge pin has good structural strength; and the reasonably-distributed oil grooves are designed, so that the service life of the hinge pin is long.