The invention discloses a rotation shaft and a rotation shaft machining method. The method comprises the following steps including rough turning, half finish turning, heat treatment, finish turning, heat treatment, fine grinding, lineation, drilling, tapping, heat treatment, assembling and warehousing. The invention discloses a shaft body machining technology. Three heat treatment technologies anda heat sleeve assembling technology are adopted, compared with a traditional machining technology, the first heat treatment technology and the second heat treatment technology adopt stress relief annealing, machining stress generated in each pass of machining is eliminated, the third heat treatment technology adopts the normalizing technology, tempering treatment is replaced, cost is reduced, andfinally the heat sleeve technology is adopted so that a shaft body can be in interference fit with the inner circle face and the outer circle face of a bearing. By usage of the shaft body machining method, the machining difficulty can be lowered, the service life of machining machines is prolonged, meanwhile, energy consumption can be reduced, the machining cost is reduced, and the quality of theshaft body is improved.