Double row ball bearings, including integral outer ring and is located inside integral outer ring and two tied for the distribution of inner ring, installed on the integral outer ring and inner ring between the number of spherical ball bearing and spherical ball bearing graphite keeping, described in the graphite cage for circular ring, graphite retainer ring ball has installed on both sides of the u-shaped fixed groove ball bearing, spherical ball bearing outer described with dust-proof sealing ring.Compared with the prior art, the double-row ball bearing mentioned in the utility model combines the outer coat of the original two single-row ball bearings, and the double-row ball bearings share a graphite cage, which has the advantages of stable structure, easy installation and long service life.