The utility model relates to a zero-sequence smoothing power saver. Three core limbs are combined, wherein the spatial positions of the three core limbs form a 120-degree angle with one another, and the three core limbs form an equilateral triangle structure. Windings, namely a winding A1, a winding A2, a winding A3, a winding B1, a winding B2, a winding B3, a winding C1, a winding C2 and a winding C3, are wound around the core limbs. The winding A3, the winding B3 and the winding C3 are wound counterclockwise, and the other windings are wound clockwise. The head end of the winding A2 is connected with the tail end of the winding A1. The tail end of the winding A2 is connected with the tail end of the winding B3. The head end of the winding B2 is connected with the tail end of the winding B1. The tail end of the winding B2 is connected with the tail end of the winding C3. The head end of the winding C2 is connected with the tail end of the winding C1. The tail end of the winding C2 is connected with the tail end of the winding A3. The head end of the winding A1, the head end of the winding B1 and the head end of the winding C1 are connected with a corresponding three-phase power cord respectively. The tail end of the winding A1, the tail end of the winding B1 and the tail end of the winding C1 serve as output ends and are connected with a load system in a matched mode. The head end of the winding A3, the head end of the winding B3 and the head end of the winding C3 are jointly connected into a neutral line of the load system.