The invention discloses a side mold opening and closing device for a high-speed railway track board production line. The side mold opening and closing device is provided with a base, wherein a lifting oil cylinder is fixed on the base; the rod end of the lifting oil cylinder is connected with a lifting stand; and a side mold opening and closing oil cylinder is arranged on the lifting stand. According to the side mold opening and closing device disclosed by the invention, the movable platform (lifting stand) which can horizontally move, and ascend and descend is arranged, and is matched with the side mold opening and closing oil cylinder, so that the purpose for fully automatically opening and closing the side mold of a track board mold is realized. The side mold opening and closing is simple in structure, high in efficiency, and suitable for being used on a full automatic production line.