Oil injector assembly with adjustable needle valve lift

The utility model belongs to the field of oil supply systems of diesel engines, and particularly discloses an oil injector assembly with adjustable needle valve lift. The oil injector assembly with the adjustable needle valve lift comprises an oil injector body, wherein an oil inlet is formed on the upper part of the oil injector body. The oil injector assembly is characterized in that the lower end of the oil injector body is connected with a needle valve body; a tightening cap which is in threaded connection with the oil injector body is sleeved outside the needle valve body; the small outer circle of the needle valve body extends out of the tightening cap; a tailless needle valve is arranged in an inner cavity of the needle valve body in a sliding mode; a transition plate is arranged between the oil injector body and the needle valve body; a center hole which penetrates through an ejector rob and a step hole which is used for controlling the needle valve lift are formed in the transition plate; a hole whic