The invention discloses an electromagnetic acceleration system of a water slide, and relates to the technical field of electromagnetism. The system comprises an acceleration device arranged on a pipeline of the water slide, and the acceleration device comprises an electromagnet which can be connected with three-phase alternating current and can be used for forming an alternating magnetic field moving forwards in the axial direction of the pipeline. The system further comprises an accelerated device capable of axially sliding forward in the pipeline of the water slide, and a permanent magnet isarranged on the accelerated device. In the scheme, the electromagnetic acceleration system is convenient to control and fast in speed increase, and a tourists can enter a sliding state instantly froma static state, so that the thrill of the slide is improved, and the situation that the tourist cannot slide on an existing slide due to an incorrect starting posture is eliminated.