The invention relates to an adjusting device for power supply circuit or distribution circuit, in particular to a cable current-sharing non-pressure adjusting device. A current-sharing adjusting device is installed on the same phase parallel cable, which is provided with a magnet with corresponding magnetic inductivity. In case that certain section of the high voltage cable is surrounded by the magnet, the inductive reactance will be enormously increased; therefore, the inductive reactance can be controlled through adjusting the magnet air gap to adjust the current of the cable and reach the current-sharing of the cable. The utility model has the advantages that the magnet is uncharged with small volume, so the operation is simple and convenient; the arrangement does not occupy the sending and receiving ends sites; the loop load loss will not be increased.