The invention relates to an electric ceramic material electrical device seismic reliability determining method. The method includes the steps of determining the distribution function of the bending strength of an electric ceramic material; correcting the distribution function of the bending strength of the electric ceramic material; determining the seismic capacity of an electrical device; determining the reliability of the electrical device; drawing a vulnerability curve chart of the electrical device. Compared with a traditional electrical device seismic reliability calculation method, the electric ceramic material electrical device seismic reliability determining method is more practical, more reasonable and capable of providing technical support for relief work, such as disaster prediction, damage assessment and contingency plan developing.