The invention provides a three-phase load adjusting device, a manufacturing method and a using method thereof. The three-phase load adjusting device comprises a power supplying end cable and a load end cable. The power supplying end cable comprises an A-phase wire, a B-phase wire and a C-phase wire. A first A-phase lead is arranged between the A-phase wire and the load end cable, and a first B-phase lead is arranged between the B-phase wire and the load end cable. A first C-phase lead is arranged between the C-phase wire and the load-end cable. Because the technical solution is utilized, the three-phase load adjusting device, the manufacturing method and the using method have advantages of realizing reasonable structure, conveniently adjusting three-phase load unbalance in a low-voltage power grid, realizing short three-phase load adjusting time, preventing influence of power supply stoppage to transformer area indexes and customer power consumption, ensuring high power consumption quality of the user, and realizing high safety and high reliability in three-phase load adjustment.