The present invention relates to a safe high-frequency output pad for a physical therapy apparatus. The present invention is provided to avoid a conventional pad for a physical therapy apparatus with various problems of causing a user side effects such as electrical instantaneous shocks or burns by failing to solve all of complex causes of a safety-related accident including an instantaneous heating phenomenon or the like such as overcurrent inflow, output functionality degradation, etc. caused by the progressive oxidation of an electrode, due to structural defects of a cover material forming an external frame or an electrode plate that does not match with the cover material. The high-frequency electrode pad of the present invention is formed in a semiconductor type which has both heat conductivity and electrical conductivity with a bipolar type electrode structure in which the flow path of high-frequency currents passes through two electrodes, and increases the contact resistance and the coefficient of thermal expansion. The distribution of heat applied to the user is controlled to be uniform by the thermostatic action of physical properties that block the current as the electrical resistance is increased by itself when the transient current flows due to predetermined power supply in response to heating due to the temperature rise, and the uneven output waveform due to an oxidation phenomenon of the electrode is prevented by a sealed coating effect, while preventing a predetermined level or higher of a current from being applied, thereby ensuring operational reliability and a long life of the pad. In addition, the safe high-frequency output pad for a physical therapy apparatus is heated by itself and rapidly increases resistance in case of the increase of the temperature around the electrode pad or the flow of a current, identical to or greater than an allowance, and interrupts the current to flow through the electrode pad by the rapidly increased resistance, there
