The invention discloses an axle bush and an axle sleeve. Both the axle bush and the axle sleeve comprise a matrix and a working surface layer, wherein the working surface layer is made of a cobalt-base alloy, and the cobalt-base alloy comprises the following components in percentage by weight: 10 to 40 percent of Cr, 0.1 to 15 percent of Ni, 0.1 to 15 percent of W, 0.1 to 10 percent of Mo, 0.01 to 5.0 percent of V, 0.01 to 5.0 percent of Ti, 0.01 to 1.5 percent of C, 0.01 to 20 percent of Fe, 0.01 to 5.0 percent of Al, 0.1 to 3.0 percent of Mn, 0.01 to 5.0 percent of Nb, 0.1 to 3.0 percent of Si, and the balance of Co. The axle bush and the axle sleeve are operated under the conditions of hot-dip aluminum-zinc liquid, hot-dip zinc liquid, hot-dip zinc aluminum, hot-dip pure aluminum liquid and the like, and have good heat-resistant fatigue properties such as good durability, enough strength and elongation, low thermal expansion coefficient, low elastic modulus and the like so as to improve the service properties and prolong the service life.