The invention belongs to the technical field of automobiles. The invention discloses a wheel reductor structure. The structure comprises a sun gear, a plurality of planet gears, a half shaft, an end cover, a wheel reductor shell, a hub, a planet carrier and a gear ring, and also comprises a shaft sleeve and a bracket fixed to the planet carrier, wherein the half shaft penetrates through the shaftsleeve from the middle part and can freely rotate in the shaft sleeve; the bracket is fixed on the shaft sleeve; the sun gear is fixed on the half shaft to be used as power input; and the gear ring isfixed on the wheel reductor shell to be used as power output. The wheel reductor structure has the beneficial effects that the planet carrier is fixed, the sun gear is adopted as power input, and thegear ring is adopted as power output, so that the reduction ratio is reduced, the transmission efficiency is improved, and market requirements are better met; meanwhile, the gear ring is integrated on the wheel reductor shell so that the weight of the wheel reductor is reduced than that in an existing structure that the gear ring and the wheel reductor shell are arranged separately.