Abstract: Abnormal treatment and analysis of energy storage circuit of disc spring hydraulic circuit breaker disc spring hydraulic circuit breaker mainly uses disc spring as energy storage element, which is an important core component of hydraulic operating mechanism for high-voltage circuit breaker, and can bear loads with large range changes under the condition of small deformation. Because of its simple structure and good stability, the hydraulic disc spring mechanism is widely used in circuit breakers of 220kV and above. This paper analyzes the abnormal treatment of the energy storage circuit of a 220kV disc spring hydraulic mechanism circuit breaker to understand its working principle and relevant treatment measures.