Oil feeding one-way valve

An oil feeding one-way valve comprises a valve body (1), a bonnet (2), a valve rod (3) and a valve pad (4), wherein the bonnet (2) is packaged at an opening end of the top of the valve body (1) and is provided with a central oil inlet hole (2.1); the valve rod (3) is in sliding fit with a central hole in the bottom wall of the valve body (1) and can move back and forth in the axial direction; and the valve pad (4) is arranged on the top of the valve rod (3) and is hermetically abutted to the bottom wall of the bonnet (2) so as to block the central oil inlet hole (2.1). The oil feeding one-way valve is characterized in that convex rings (1.2) of which outer side walls are used for finish machining are respectively arranged on the outer side walls of the upper end and the lower end of the valve body (1); an annular pressure pad (2.2) which is projected downwards is arranged on the bottom wall of the bonnet (2) and along the periphery of the central oil inlet hole (2.1); and the bottom surface of the annular pressure pad (2.2) is used for finish machining and is hermetically abutted to the top of the valve pad (4). The finish machining area of the oil feeding one-way valve can be reduced effectively, and the machining cost can be reduced effectively.