The invention discloses a comprehensive energy system optimal configuration method considering N-1 safety constraints. According to the technical scheme, the method comprises the following steps: 1) constructing electricity-gas-heat combined supply energy hub architecture and an energy hub model, wherein the energy hub model comprises an energy conversion equipment model, a multi-element energy storage equipment model and an energy hub coupling relationship model, 2) taking minimum annual comprehensive operation cost in a system planning period as an objective function, and considering energycoupling part constraint, power system operation constraint, natural gas system operation constraint and N-1 safety constraint of a power system, establishing a comprehensive energy system optimal configuration model; and 3) performing relaxation processing on the comprehensive energy system optimal configuration model so that the problem of mixed integer nonlinear programming can be converted into the problem of mixed integer second-order cone programming. The system safety and the energy supply flexibility can be enhanced and the technical support can be provided for architecture design andequipment model selection of the multi-energy hub in the comprehensive energy system.