Gear anti-falling sealing structure resistant to heavy impact

The invention discloses a heavy-type-impact-resistant gear anti-disengaging sealing structure which comprises a shaft type clamping ring and a sealing piece which are installed between a gear and a spline shaft, and the spline shaft is provided with a baffle ring installation groove used for installing a split baffle ring, at least one sealing groove provided with the sealing piece and a clamping groove used for installing the shaft type clamping ring. The baffle ring mounting groove is formed in a tooth part, used for mounting a gear, of the spline shaft, and the tooth part is divided into two parts by the baffle ring mounting groove; the outer end of the gear is provided with an anti-disengagement cover mounting groove for containing the anti-disengagement cover, the spline shaft is sleeved with the anti-disengagement cover, the anti-disengagement cover covers the split baffle ring and one sealing piece, the anti-disengagement cover is locked between the shaft type clamping ring and a shoulder of the anti-d