An electromagnetic valve with a differential pressure resistance valve core is composed of a valve rod, a press cap, a V-shaped sealing ring, a gasket, a sealing pad, a nut, a valve core, a large O-shaped ring, a stifle, a sealing gasket, a valve body, a valve core seat, a small sealing ring, a spring, a small O-shaped ring, a middle O-shaped ring and an electromagnet. The valve core is in a thin-wall cylindrical shape, one end of the valve core is open, the other end is provided with an end face plate, a step connected with the valve rod is positioned in the center of the end face plate, and through holes are arranged on the periphery of the step. A blocking shoulder is arranged at the periphery of the valve core to limit journey of the valve core to improve sealing performance. Under the action of the electromagnet, an upward-moving valve on the valve core is in a close state, pressure water is filled with the valve core and a cavity communicated with the valve core, the sum of axial force stressed on the valve core is nearly zero, pressure difference inside and outside the cylinder wall of the valve core is large, axial force stressed on in the cylinder wall is enough to enable the thin wall of the valve core to expand and deform, and sealing between the valve core and the valve is reliable. When the valve core moves downwards, the valve is open, and water pressure has no side effects on the valve core.