The present invention relates to a high-frequency thermotherapy device. More specifically, when a detection signal related to normal muscularity and abnormal muscularity, inputted through a sensor module, is received, the high-frequency thermotherapy device automatically changes the detection signal to have a frequency of 2 to 5 MHz in a frequency adjustment oscillation module of an impedance detection unit, and generates a high frequency in a high-frequency generation unit according to an impedance value, so as to provide the changed frequency to the location of the abnormal muscularity or skin, thereby enabling a treatment effect for deformation or various inflammations of the abnormal muscularity without damaging the normal muscularity and a reduction in the amount of a pain-killer used by alleviating pain, selectively adjusting an output from among three stages of strong, intermediate and weak according to a state of an affected part in a control panel unit of a display, adjusting voltage settings, and receiving power from a second power source unit and control a ceramic member to sequentially generate deep heat according to a set time of a timer in a control unit.
