Low-voltage network boosting compensating box

The utility model relates to a voltage boosting compensating box of a low-voltage network, which is characterized in that a compensating capacitor is thrown into an electric network to compensate reactive power by a main contact head of a contactor, to lower line current and line loss and to increase voltage of a power utilization terminal, wherein, the main contact head is connected in parallel with a current composed of an auxiliary contact head connected in series with a current limiting resistor; the travel range of the auxiliary contact head is smaller than the travel range of the main contact head, which leads 0.5 second to switch on than the main contact head, and therefore, the charging current of the capacitor is limited by the current limiting resistor. The utility model does not generate inrush current when the capacitor is thrown in. The compensating box has the advantages of simple structure, low cost, rapid obtain result of enhancing power supply quality to dispersed inhabitant areas or rural users, and low expense.