The invention discloses a traction pin mounting seat mechanism. The traction pin mounting seat mechanism comprises a traction pin mounting seat, a vertical adjusting mechanism, a longitudinal adjusting mechanism and a base, wherein the longitudinal adjusting mechanism specifically comprises a screw rod, a nut, a driving bevel gear and a driven bevel gear; the screw rod is longitudinally arranged, the two ends of the screw rod are supported on the base in a rotating manner, and the screw rod is provided with a threaded section matched with the nut; the nut and the base are circumferentially limited, and the nut is connected with the vertical adjusting mechanism; the driving bevel gear is horizontally arranged, and the two ends of the driving bevel gear are supported on the base in a rotating manner; and the driven bevel gear is arranged at the head of the screw rod. According to the traction pin mounting seat mechanism disclosed by the invention, the longitudinal adjusting mechanism and the vertical adjusting mechanism are integrated on the base, so that the longitudinal adjusting mechanism and the vertical adjusting mechanism can be mounted on the base in advance; and besides, a positioning structure which is mounted in a manner of being matched with a vehicle body is arranged on the base, so that an assembly can be quickly and integrally mounted in a corresponding position of the vehicle body, the mounting efficiency of the traction pin mounting seat mechanism is greatly improved, and the transportation efficiency of a vehicle is improved.