The utility model relates to an electromagnetic whirlwind device with an opening in a single side and a supporting device thereof and belongs to the technical field of continuous casting. The utility model provides a conveniently mounted electromagnetic whirlwind device with the opening in the single side and the supporting device thereof. According to the utility model, under the condition of ensuring the water gap electromagnetic whirlwind, the on-site continuous casting is fully considered, and the operation space of on-site workers is increased as much as possible. The electromagnetic whirlwind device provided by the utility model comprises an electromagnetic whirlwind device main body with the opening in one side; an iron core and a winding are arranged in the electromagnetic whirlwind device main body; the iron core has a shape of tooth socket with an opening in one side; the opening of the iron core is corresponding to the opening of the electromagnetic whirlwind device main body; the winding is wound on the iron core. The supporting device of the electromagnetic whirlwind device provided by the utility model is composed of a supporting rod; one end of the supporting rod is fixedly connected with the electromagnetic whirlwind device main body while the other end is fixedly connected with a tundish cross beam.