The invention relates to a radiator fan which comprises a fan frame, a rotor member and a stator member; wherein, the fan frame protrudes in the center of the fan frame bottom to form an axle seat; an axial through hole is arranged in a bearing and the bearing is accommodated in the axle seat; the rotor member is provided with a rotary shaft accommodated in the through hole in the bearing; the stator member is sleeved on the outer edge of the axle seat, and comprises an upper insulation sheet, a lower insulation sheet and a multi-layer silicon-steel sheet clamped between the upper insulation sheet and the lower insulation sheet; wherein, the upper insulation sheet integrally extends towards the inner side of the central position of the rotary shaft to form an oil blocking structure, and the oil blocking structure extends to the external surface close to the rotary shaft. When the fan runs, the oil blocking structure can block and prevent lubricating oil from leaking out, thus ensuring longer service life of the radiator fan and almost adding no extra cost.