The invention discloses a large-power radio-frequency reactor which is composed of a magnetic ring group, a winding, an amphenol connector and insulating pipes. At least one magnetic ring group is arranged and each group is formed by overlaying multiple alloy magnetic powder rings in parallel. The winding is penetrated through the magnetic ring group in a winding mode through a Leeds line. The winding is connected with an external connecting wire through the amphenol connector and two externally-connecting ends of the winding are sleeved with the insulating pipes. The working frequency of the large-power radio-frequency reactor ranges from 10kHz to 200kHz and working currents can reach 1200A. A cooling manner is a natural cooling manner and the service life of the reactor can reach 20 years.