The invention relates to an off-grid 
integrated energy system double-layer 
planning method. The method comprises the steps of: obtaining 
renewable energy typical day data, cold, heat and electric loadhistorical data, equipment parameters in an 
integrated energy system, operation parameters and operation conditions of the 
integrated energy system; constructing a 
mathematical model of each 
energy supply device in the comprehensive 
energy system; according to the structure of the comprehensive 
energy system, constructing the double-layer optimization model of the comprehensive 
energy system, enabling the upper-layer optimization model to plan the 
system equipment capacity with the minimum total cost of the off-grid integrated energy 
system as the target, and enabling the lower-layer optimization model to optimize the 
system operation state with the minimum system load shortage as the target; and solving the double-layer optimization model to obtain the optimal capacity configuration result of the integrated energy system. An 
electricity-to-gas conversion device is applied to off-grid integrated energy system planning, the 
electricity-gas 
coupling performance is improved, the system cost is reduced, and the economy of the system is improved.