The invention provides a tractor hub assembly. The tractor hub assembly comprises a hub, wherein a circular boss is arranged on the hub; a shaft sleeve is assembled in the middle of the hub and connected with the hub through a spline; a flange plate is arranged at the tail end of the shaft sleeve, and bolt holes are formed in the flange plate; bolt holes corresponding to the flange plate at the tail end of the shaft sleeve are formed in the circular boss of the hub; bolts penetrate through the bolt holes in the flange plate to be connected with the boss of the hub; the outer side of the boss of the hub is an external round surface, and bolt holes for mounting the hub on a tractor are formed in the external round surface; a key slot and a notch are formed in the shaft sleeve; the spline between the shaft sleeve and the hub is embedded in the outer side of the notch. The hub assembly is high in strength and rigidity as well as good in malleability and abrasion resistance and meets requirements of complex working conditions of the tractor, the machining technology is reasonable, and the yield is high.