The utility model discloses a reactive compensation control system, include the reactive compensation controlling means, rectifier circuit, dc -to -ac converter and the transformer that are connected with the electric wire netting, reactive compensation controlling means is including the installation mother board to and respectively through mutual -inductor picture peg, collector picture peg, treater picture peg and the controller picture peg of socket grafting on the installation mother board, still include display device and input device, the mutual -inductor picture peg is connected with the mains supply end, the collector picture peg is connected with rectifier circuit, the treater picture peg respectively with the mutual -inductor picture peg with the collector picture peg is connected, the controller picture peg is connected with the treater picture peg. The utility model provides an among the prior art reactive compensation controlling means carry out the unsafe problem of var control, realized that collection electric signal is complete, more accurate to the running state's of system judgement to reactive compensation control is carried out to power supply system to the accuracy.