A concentric type voltage mutual inductor is designed for solving the problem that an existing outdoor type voltage mutual inductor is high in cost, complicated in line and the like. A voltage mutual inductor is increased in a transformer and shares an iron core with a high-low voltage line of the transformer. A measuring winding, namely the voltage mutual inductor is increased outside the iron core and wound on a high-low voltage coil of the transformer directly. The concentric type voltage mutual inductor has the advantage that the voltage mutual inductor is increased in the transformer, shares the iron core with the high-low voltage line of the transformer, is compact in structure, small in volume, simple to operate and convenient to wind, reduces cost of the transformer furthest, and solves the problem that the outdoor type voltage mutual inductor is high in cost, complicated in line and the like.