The invention discloses a routing optimization method and device. The method comprises the following steps: selecting an edge having the maximum vulnerability value in a topological structure of an electric power communication network, wherein the edge is a connecting line between two nodes in the topological structure; performing routing adjustment on first specified business born on the selected edge to obtain adjusted routing; based on the adjusted routing, calculating a network vulnerability balance value VBD in the electric power communication network; judging whether the VBD is greater than the initial VBD, wherein the initial VBD is the VBD in the electric power communication network prior to the routing adjustment; and determining whether the routing optimization is ended according to the judgment result. By adoption of the routing optimization method and device disclosed by the invention, the technical problem of uneven distribution of overall network vulnerability in the prior art is solved.