The utility model relates to a repulsion formula is magnetic spring check valve forever belongs to the hydraulic transmission technology field. The utility model discloses a valve body, hexagonal endcap, case, cylindrical permanent magnet A, cylindrical permanent magnet B, O type sealing washer C, valve gap board, the valve body left end is equipped with the hexagonal end cap, and it is fixed with the case that cylindrical permanent magnet A passes through interference fit, and cylindrical permanent magnet B is located the valve body upper end, and O type sealing washer C fix on the valve gapboard, and the valve gap board is fixed in on the valve body. The utility model discloses magnetism spring simple structure, no fatigue failure have guaranteed the operational reliability of check valve. Magnetic spring reaction forever is sensitive, and one -way valve opening pressure is little. Magnetic spring case vibration forever is little, and the noise is low. Magnetic spring power transmission line is short forever, check valve compact structure, and the size is little.