Abstract: In this paper, the author summarizes four discharge patterns based on the analysis of common high-voltage switch cabinet faults and the causes of insulation faults with highest fault rate. By establishing the high-voltage switch cabinet's multi-channel power-on comprehensive diagnostic platform, the author uses the needle plate discharge model to simulate partial discharge source so as to conduct the experimental research and uses four-channel transmission signals' arrival sequence to conduct the partial discharge source positioning. Based on the comparative analysis of partial discharge signals through simulation, the author adopts the anti-jamming technology to conduct the research on internal discharge and external interference signals' pulse wave form. Based on the discharge signals' pulse waveform, the author successfully establishes high-voltage switch cabinet's anti-jamming partial discharge detection system.