The invention discloses a high-frequency magnetic probe diagnosis system for measuring ion cyclotron radiation. The high-frequency magnetic probe diagnosis system comprises a vacuum coaxial electrode,a high-temperature and high-voltage resistant coaxial cable, an ultrahigh-frequency magnetic probe, a power divider, a detector, a spectrum analyzer and a signal acquisition system, wherein the vacuum coaxial electrode and the high-temperature and high-voltage resistant coaxial cable are used for transmitting a radio-frequency signal from the interior of Tokamak to the exterior of Tokamak, the ultrahigh-frequency magnetic probe is used for coupling the radio-frequency signal, the power divider is used for dividing a source signal to eight paths of signals in an equal amplitude way, the detector is used for detecting a peak of the probe radio-frequency signal and outputting a DC signal, the spectrum analyzer is used for converting the radio-frequency signal from time domain to frequency domain, and the signal acquisition system is used for storing the acquired voltage signal in a computer. The magnetic probe diagnosis system is passive, no radio-frequency wave or gas can be injected into plasma, thus, no influence on the plasma is generated, and the magnetic probe diagnosis system is of important significance to research on fusion alpha ions and high-energy beam ions, is simple instructure and low in cost and is convenient to operate.