The invention relates to the field of bearings, in particular to a ceramic bearing which comprises a rotating structure, an outer sleeve, a limiting structure, a guiding structure, a scrap removing structure, a plurality of balls and a heat dissipation structure. Due to the arrangement of the guiding structure, the contact area between the balls and the outside is reduced, foreign matter is effectively prevented from blocking the rotating structure and the outer sleeve, and the rotation between the outer sleeve and the guiding structure is more flexible in cooperation with the use of the heatdissipation structure on the guiding structure; the heat dissipation structure is squeezed by the outer sleeve, air circulation between the guiding structure and the outer sleeve is promoted, therefore, dust is prevented from being accumulated on the balls, and heat dissipation can be conveniently carried out on the balls and the outer sleeve. The scrap removing mechanism is arranged on the outersleeve, scraps between the outer sleeve and the guiding structure and damaged balls can be conveniently removed, and other balls are effectively prevented from being scraped. The using performance ofthe ceramic bearing is improved, meanwhile, the heat dissipation structure is conveniently reset through the scrap removing mechanism, a reset structure is in linkage with the scrap removing mechanism, and the scrap removing effect is better.