These proceedings highlight the fundamental researches and up-to-data developments on energy conversion and high-voltage application by means of low temperature and atmospheric pressure plasma. In recent years, plasma-assisted energy conversion gains increasing attention as an alternative to thermal-catalysis or electro-catalysis. These proceedings discuss and exchange cutting-edge scientific innovations and technological advances in fields like plasma-enabled synthesis of chemicals and fuels, plasma-enabled the environmental clean-up, plasma-enabled catalysis treatment, in-situ probing of plasma-catalyst interactions and its high-voltage applications, which show great potentials in industrial demands like CO2 hydrogenation, CH4 reforming and nitrogen fixation, plasma deposition, chemical synthesis, VOC abatement and high-voltage insulation. This collection of papers presents the main applications of plasma-induced energy conversion and high-voltage discharge in the form of separate chapters, including cutting-edge studies on conversion technology, complex mechanism simulation, in-situ detection and converged applications by artificial intelligence. These proceedings are suitable for researchers engaged in fields like plasma-catalysis, discharge diagnosis and modelling, chemical modelling and high-voltage applications. The major topics covered in the conference proceedings are: 1) Advanced plasma-catalysis conversion technology; 2) Advanced in-situ discharge diagnosis technology; 3) Advanced in-situ plasma-catalysis characterization; 4) Multi-scale or innovative modelling technology; 5) High-voltage discharge and application.