Bushing closing-up processing method

The invention provides a bushing closing-up processing method in which one-step closing-up formation is changed into tri-closing up formation. The bushing closing-up processing method is characterized by mainly comprising three steps of pre-deformation, re-deformation and final deformation. The bushing closing-up processing method is simple and feasible, has good practicability and effectively solves the problem that a lock pin is tightly squeezed by a bushing.