The invention discloses a method and apparatus for emulation of a latent mechanical fault vibration signal of a high voltage circuit breaker. The method involves the multi-body dynamics simulation ofa high voltage circuit breaker and the finite element simulation of a vibration signal, and includes the steps of firstly, determining a high voltage circuit breaker multi-body dynamics model parameter and a bracket finite element model parameter through a rod piece force test and a bracket vibration signal test under the normal operation of a high voltage circuit breaker; and secondly, modifyingthe parameter in the multi-body dynamics model to simulate a mechanical fault of the high-voltage circuit breaker to conduct emulation, extracting force curves of a bracket and other components at respective connection positions under a fault condition, loading the force curves into the bracket finite element model as the excitation to make emulation, and extracting a vibration signal of a selected measuring point on the bracket under the fault condition. By analyzing the obtained vibration signal of the latent mechanical fault of the high voltage circuit breaker through emulation, the methodand apparatus in the invention can obtain fault characteristics of the high voltage circuit breaker quickly, which has a positive significance for fault detection and product development.