In order to solve the problems of too long action time and low action reliability of electromagnetic type tripping release of vacuum circuit breaker. This paper researches and designs a kind of rated control voltage is DC220V, tripping action time is less than 15ms, tripping current is less than 2A permanent magnetic detacher. Firstly, Solidworks software is applied to establish the 3D model of the permanent magnet detacher and simplify the model. Considering the key components of the permanent magnet detacher, Maxwell simulation software is applied to analyze the dynamic and static simulation of the permanent magnet detacher, which finally meets the design requirements and is verified by tests. The test results show that the designed permanent magnetic detacher can shorten the breaking time of vacuum circuit breaker from the original 30ms to less than 15ms under its rated control voltage. The research results of this thesis can provide guidance for the simulation and optimization design of permanent magnet detacher, which has certain engineering application value.