The invention discloses a wide-range zero-flux current scaling converter which comprises a magnetic balance detecting winding, a proportional winding, a circular core I, a circular core II, a current sampling resistor, a magnetic balance detecting and driving circuit, and a plurality of proportional winding range switching relays, wherein the magnetic balance detecting winding is uniformly wound on the circular core I, and then the circular core II is embedded in the circular core I; the proportional winding as well as a primary winding is uniformly wound on the circular core I and the circular core II; a secondary proportional winding N2 comprises a plurality of proportionally segmented windings; the proportionally segmented windings correspond to proportionally segmented winding terminals; the proportionally segmented winding terminals correspond to the proportional winding range switching relays. According to the wide-range zero-flux current scaling converter, the problem that the current range adaptability is low is solved; current can be detected automatically by utilizing the wide-range zero-flux current scaling converter.