The invention discloses a high-performance oil injector which comprises an oil inlet pipe and a magnetic isolation pipe. The oil inlet pipe and the magnetic isolation pipe are arranged on an upper port and a lower port of an oil injector shell. An armature, a valve base and a flow guide plate are arranged in the magnetic isolation pipe from top to bottom. The oil inlet pipe is extended downwards into the magnetic isolation pipe to be opposite to the armature. A reset spring is installed between the armature and the pipe body in the extended section in a pressed mode. Limitation in the axial direction and radial direction is achieved. An electromagnetic coil surrounds the pipe body in the extended section in the oil injector shell and is positioned to the armature through a coil holder. A conical pipe on the lower portion of the armature is provided with an axial flow through hole. A ball valve is arranged at the bottom of the conical pipe. Under the effect of the reset spring, the armature presses and seals the ball valve in a conical oil inlet hole in the valve base. The flow guide plate is a spherical plate with the downward radian. The spherical plate is provided with a radial oil injection hole. According to the high-performance oil injector, the cost is low, the assembly precision is high, magnetic resistance is low, magnetic force is large, the armature is high in start speed and stable in operation, oil mist particles are small, atomization is uniform, the injection angle adjusting range is large, and the flow coefficient is stable.