The invention provides an electric power communication network reliability analysis method. The electric power communication network reliability analysis method comprises steps that, a matrix method is utilized to describe the electric power communication network business topology; when the network business topology fails, a link failure matrix is generated; an influence scope of a failure link is analyzed through determining whether a business channel exists; crucial parts of a system are determined, a crucial part failure set is acquired; optimization for the crucial part failure set is carried out, and the smallest load business channel is acquired; a new thinking method is provided for electric power communication network reliability evaluation, the storage space of the network matrix is only represented in the process, problems of high complexity of the electric power communication network topology, large storage space and inconvenient calculation are simply and effectively solved.