The invention discloses a linear electromagnetic driving plunger pump, belongs to volumetric fluid conveying pumps and is applicable to pressure pumping, pressure accumulation, pressure stabilization and overflow protection of the fuel of an electronic fuel injection system of an internal combustion engine. The linear electromagnetic driving plunger pump comprises a pump body, an upper cover, a lower cover, an electromagnetic coil, an armature, a return spring, an inlet joint, an outlet joint, a sleeve, a valve core, a supporting pipe, a diaphragm, a nut, an overflow port joint, a plunger rod and a leakage flow port joint. Under the action of electromagnetic force and spring force, the plunger rod reciprocates, gasoline pumping is realized, the total pressure of a pressure accumulating cavity is low in fluctuation, the linear electromagnetic driving plunger pump has pressure accumulation, pressure stabilization and overflow functions, accurate control can be realized, and an operating period of an electromagnet can be shortened, so the reliability is improved. The linear electromagnetic driving plunger pump which serves as an oil sprayer is applicable to an internal combustion engine system, and great significance is provided for realization of accurate and reliable oil spraying control over the internal combustion engine.