The utility model discloses a harmonic control system of converter: including connecting passive filter (2) and active filter (3) between electric wire netting (1) and load, the load is converter (4), passive filter (2) include the LC filter network that comprises inductance and electric capacity to the antithetical couplet is in the circuit of converter input, active filter (3) are including detecting system (31), control system (32), actuating system (33), compensating system (34) and high frequency filter (35) parallelly connected with compensating system (34) of establishing ties in proper order, connect in parallel in the circuit between passive filter (2) and converter (4) active filter (3). The utility model discloses the converter interference killing feature can be improved and system's reliability of operation is guaranteed simultaneously.