The utility model discloses a controllable parallel reactor of magnetic control type, including body and excitation system, the body is three winding constructions high -pressure side winding, control winding and compensating winding, excitation system including exchange the side with compensating winding link to each other from excitation system and with the station with the outer excitation system that the power links to each other, still include rectifier output protective film piece, rectifier output protective film piece is connected with the dc bus of rectifier output, rectifier output protective film piece includes balance resistance, measuring resistance and arrester. The utility model provides a technical scheme can ensure the safety of commutation equipment, and electrical equipment is damaged to rectifier outlet side overvoltage when avoiding the trouble and strikeing, improves controllable parallel reactor of magnetic control type reliability of operation and security, and guarantee controllable parallel reactor of magnetic control type has given play to idle balance, stabilizing the voltage's function in the system.