Apparatus for detecting power supply current

The utility model relates to a supply current detecting device which comprises a current transformer; wherein the current transformer comprises an original edge and a detecting edge, and the original edge is connected with a current shunting element in parallel. Adopting a way that two pins at the original edge of the rated low power current transformer are connected with a current shunting conductor in parallel, the supply current detecting device realizes achieves testing the heavy current through an existing low power current transformer, thereby effectively reducing the weight and volume of the electric and electronic equipment, lowering cost and reducing loss of the system.