Spline pair with long-acting lubricating effect

The utility model discloses a spline pair with a long-acting lubricating effect, and aims to solve the problems that only a small amount of lubricating oil can be added into an existing spline pair at a time, lubrication cannot be kept for a long time, a spline is abraded, and the service life of the spline pair is affected. The spline shaft comprises a spline shaft body, a spline sleeve and a connecting fork head, a plurality of sets of spline teeth are arranged on the spline shaft body, the spline teeth are evenly distributed around the spline shaft body, the spline sleeve is of a hollow sleeve structure, a plurality of key grooves are formed in the inner wall of the spline sleeve, the number of the key grooves is the same as that of the spline teeth, and the spline sleeve is arranged on the spline shaft body. The spline teeth are connected with the key grooves in an attached mode, a sealing assembly is arranged on the outer side of the spline sleeve, and a lubricating assembly is arranged in the spline sle