Device for carrying out diathermic and muscle stimulation treatments, comprising: - a single power generator, to which there are connected a return electrode, and at the opposite pole, at least two electrodes, positioned on a handpiece and separated from each other by means of insulating material, - an electronic control unit configured to manage the power supplied by said power generator between said return electrode and said at least two electrodes, wherein said electronic control unit is configured to generate a whole voltage signal, made up of the combination of two functional signals, between the electrodes on the handpiece and the return electrode: - a first functional signal comprising a series of pulses in the frequency spectrum generating diathermy; - a second functional signal comprising a series of time variable amplitude radiofrequency pulses, for which the development of the maximum voltage of the pulse over time provides a waveform equal to the development of the action potential of muscle, said first and second signal being combined so that the amplitude thereof is controlled in independent way, said device being characterized in that it comprises also means for measuring the current flowing through each of said at least two electrodes positioned on the handpiece and said control unit is configured to adapt the intensity of the diathermic treatment, by varying the voltage of said first functional signal in a directly proportional way to the number of electrodes provided on the handpiece for which the measured current intensity is null and in that it comprises at least one accelerometer integral with said handpiece and connected to said electronic control unit, said electronic control unit being configured to receive in input the acceleration signal detected by said accelerometer, to integrate such signal to obtain a speed signal and to adjust the power supplied in a directly proportional way to the sliding speed of the handpiece on the treated area. - a single power generator, to which there are connected a return electrode, and at the opposite pole, at least two electrodes, positioned on a handpiece and separated from each other by means of insulating material, - an electronic control unit configured to manage the power supplied by said power generator between said return electrode and said at least two electrodes, said electronic control unit is configured to generate a whole voltage signal, made up of the combination of two functional signals, between the electrodes on the handpiece and the return electrode: - a first functional signal comprising a series of pulses in the frequency spectrum generating diathermy; - a second functional signal comprising a series of time variable amplitude radiofrequency pulses, for which the development of the maximum voltage of the pulse over time provides a waveform equal to the development of the action potential of muscle, said first and second signal being combined so that the amplitude thereof is controlled in independent way, - a first functional signal comprising a series of pulses in the frequency spectrum generating diathermy; - a second functional signal comprising a series of time variable amplitude radiofrequency pulses, for which the development of the maximum voltage of the pulse over time provides a waveform equal to the development of the action potential of muscle, said first and second signal being combined so that the amplitude thereof is controlled in independent way, said device being characterized in that it comprises also means for measuring the current flowing through each of said at least two electrodes positioned on the handpiece and said control unit is configured to adapt the intensity of the diathermic treatment, by varying the voltage of said first functional signal in a directly proportional way to the number of electrodes provided on the handpiece for which the measured current intensity is null and in that it comprises at least one accelerometer integral with said handpiece and connected to said electronic control unit, said electronic control unit being configured to receive in input the acceleration signal detected by said accelerometer, to integrate such signal to obtain a speed signal and to adjust the power supplied in a directly proportional way to the sliding speed of the handpiece on the treated area.