The utility model discloses a hall current mutual -inductor, including the magnetic loop with place the hall element in the magnetic loop, the magnetic loop has two at least air gaps, at least one hall element places in one of them air gap. Has the central symmetry of a pair of air gap about the magnetic loop in two at least air gaps at least. Two hall element place respectively in a pair of air gap of the centrosymmetric about the magnetic loop, and these two hall element are also about the central symmetry of magnetic loop. The utility model discloses a hall current mutual -inductor adopts two at least air gaps in the magnetic loop, the total length that has increased the air gap does not but increase the length of single air gap, is difficult to produce magnetic field and disperses and the magnetic field interference, can effectively improve electric current linear detection scope. Hall element through the symmetry sets up can further promote the detection precision.