Special bearing for hydrogen circulating pump of fuel cell system

The invention relates to a special bearing for a hydrogen circulating pump of a fuel cell system. The special bearing comprises an inner ring, an outer ring, a rolling body, a retainer and a pair of sealing pieces, the pair of sealing pieces are arranged on the two axial sides of the retainer respectively, the inner edges and the outer edges of the sealing pieces are matched with the inner ring and the outer ring in a sealing mode respectively and combined to form a sealing cavity, a self-lubricating system is formed in the cavity, and the self-lubricating system comprises the retainer with the self-lubricating capacity and solid lubricating grease contained in the cavity. Due to the sealing property of the chamber, internal grease is prevented from volatilizing and electric pile poisoning is avoided; meanwhile, an anti-loosening structure is further arranged on the outer wall of the outer ring, the anti-loosening structure comprises an eccentric groove formed in the outer wall of the outer ring and an anti-l