Because the pulse frequency of VHF micro-EDM power supply (30–300 MHz) is higher than that of traditional EDM power supply and the pulse has two characteristics of positive and negative bipolar, it is impossible to use traditional discharge state detection technology to meet the requirements of VHF discharge state detection. And during the experiment, it was found that the resonant frequency of the VHF pulse would migrate with the change of circuit impedance, leading to the change of pulse voltage amplitude. In order to break through the limitations of traditional detection method, this paper combined the technology of EDM discharge state recognition and microwave detecting technology, based on the principle of electrode impedance change, put forward a discharge condition detection method of VHF pulse source based on energy principle of coupling detection, the method using a double-directional coupler and rf receiver device for detecting pulse energy. It can detect the inter-electrode power of a VHF pulse source with a frequency range from 30 to 300 MHz and a power range below 100 W and realize accurate discharge status identification of VHF micro-EDM.