The invention provides an electrically-controlled pressure-storage oil injector. The oil injector comprises an oil injector body and a control plunger rod; a control valve, an armature assembly, a solenoid valve spring, a solenoid valve and first compacting mechanism are sequentially arranged above the oil injector body from bottom to top, the control valve is in pressing connection with the oil injector body through a second pressing mechanism, the control plunger rod is mounted in the oil injector body, and the exterior of the control plunger rod is sleeved with a needle valve spring; and the lower end of the oil injector body is provided with an oil nozzle matching part, an oil inlet channel is arranged in the oil nozzle matching part, the control plunger rod and the valve needle of theoil nozzle matching part are of an integral structure, the needle valve spring presses the valve needle of the oil nozzle matching part on the valve body, the large head of the control plunger rod and the oil nozzle matching part form a control plunger cavity in the oil injector body, and the control plunger cavity communicates with the high-pressure oil inlet channel. According to the electrically-controlled pressure-storage oil injector, the pressure of the control plunger cavity is controlled through throttling holes, so that the effect of improving the opening power of the needle valve and reducing the opening resistance of the needle valve is realized, and therefore the oil injection performance is optimized.