The invention relates to a power generation plan evaluation method based on a combination weight ELECTRE evaluation model. The method comprises the following steps: establishing a power generation plan evaluation indicator system, including security indicators, energy saving indicators, economic efficiency indicators and environmental indicators; calculating the subjective weight based on an ordered binary comparison method; calculating the objective weight based on a variation coefficient method; calculating the comprehensive weight based on vector similarity; and formulating an ELECTRE-based optimized decision scheme. By adopting the method, experience dependence caused by evaluation based on the subjective weight alone is overcome, and the credibility of evaluation results is ensured.