The invention discloses a current sensor and a multi-flux balancing control circuit thereof. According to the current sensor and multi-flux balancing control circuit thereof, the multi-flux balancingcontrol circuit comprising an exciting flux balancing module and an AC-DC flux balancing module is adopted in the current sensor, the exciting flux balancing module generates an exciting compensationmagnetic field according to a detected interfering magnetic field, magnetic flux of a magnetic field, formed by superimposing the exciting compensation magnetic field and the interfering magnetic field, passing through a plane perpendicular to its magnetic induction lines is zero; the AC-DC flux balancing module generates an AC-DC compensating magnetic field according to a detected A flux signal and a DC magnetic bias signal output by means of an excitation module, and magnetic flux of a magnetic field, formed by superimposing the AC-DC compensating magnetic field, a DC magnetic bias magneticfield and an AC magnetic field, passing through a plane perpendicular to its magnetic induction lines is zero, thereby eliminating the magnetic field interference generated by the excitation module, realizing precise detection of the alternating current and the direct current, improving the current detection precision of the sensor, and reducing the production cost of the sensor.