In order to solve the safety problems of traditional high-voltage switchgear during operation,numerical simulation combined with theoretical analysis is used to optimize the design.Firstly,the problems of the switchgear are analysed,so that a new type of high-voltage switchgear is given,and the design of internal structure and optimization of wiring are given;meanwhile,the analysis is carried out by using numerical simulation software,so as to confirm the feasibility of the designed high-voltage switchgear.At the same time,numerical simulation software is used to confirm the feasibility of the designed high-voltage switchgear,which effectively solves the problem of high operating temperature and realises the design concept of"non-stop power supply for maintenance,fewer power failures,deployable loads and intelligent operation and maintenance".