The invention aims to provide a rear shaft bushing used for adjustment and having adjustable rigidity. The rear shaft bushing is convenient to manufacture and low in cost, has a wide rigidity adjusting range and can effectively reduce the design cost and shorten the design cycle. The rear shaft bushing used for adjustment and with the adjustable rigidity is composed of a framework and rigidity adjusting blocks matched with the framework in a removable mode; the framework is provided with a plurality of accommodating holes, and the axes of the accommodating holes are parallel to the axial direction of the framework; and at least one ends of the accommodating holes are open so that the accommodating holes can be used for accommodating the rigidity adjusting blocks. According to the rear shaft bushing used for adjustment and having the adjustable rigidity, the removable rigidity adjusting blocks are designed, the rigidity adjustment requirements of the rear shaft bushing can be met by adopting rigidity adjusting combinations different in hardness, material and quantity, and multiple rear shaft bushings do not need to be designed at the same time, so that the development time of the rear shaft bushing is shortened, and the development cost is reduced.