Dust discharging valve of abrasion resistant sintering machine without leakage

The invention relates to a dust discharging valve of an abrasion resistant sintering machine without leakage, belonging to the sealing technology field. The dust discharging valve is mainly applied to the bottom part of an air box of a sintering machine in metallurgical industry and comprises a dust discharging box body, wherein a feeding port is formed in the upper part of the dust discharging box body and a material discharge hole is formed in the lower part of the dust discharging box body, the bottom part of the feeding port is provided with an arc-shaped valve plate articulated on a rotating arm, a circular-truncated-cone-shaped magnetic seal is arranged at the lower part of the feeding port, magnetic sealing medium is filled in the circular truncated cone surface, a circular-truncated-cone-shaped magnetizer is arranged on the contact surface between the upper end of the outer side of the valve plate and the magnetic seal and is used for matching the circular-truncated-cone-shaped magnetic seal, and an a