The frequent occurrence of extreme natural disasters has a serious impact on the safe operation of the integrated electric-gas energy system. However, the resilience of the system can be effectively improved by formulating reasonable planning strategies before the disasters occur. A pre-disaster planning method for resilience enhancement of the integrated electric-gas energy system is proposed by combining expansion and reinforcement planning with robust optimization and information gap decision theory (IGDT). First, typhoon is taken as a typical disaster, its uncertainty modeling is built, and the spatio-temporal uncertain fault set of the system is obtained. Second, a three-level hybrid IGDT planning model of resilience enhancement is established. The upper and middle layer model is built as robust expension planning. The upper layer is the normal investment expansion planning model, the middle layer optimizes the minimum load loss under the most severe disaster based on the upper layer, and the lower layer carries out the system reinforcement planning based on IGDT with the result of the upper and middle layer model. Then, the column and constraint generation algorithm is applied to solve the model. Finally, a test is given to verify the effectiveness of the model and the method.