With the rise of intelligent operation and maintenance business of integrated energy system (IES-IOMB), in order to promote the transformation and upgrading of operation and maintenance business and the enhancement of the level of intelligence, an evaluation method for the implementation effect of IES-IOMB is proposed. Firstly, based on the principle of evaluation index selection, the evaluation index system of the implementation effect of IES-IOMB is constructed, and the scoring model of each index is established respectively. Then, an evaluation index weight determination method based on AHP-CRITIC combination assignment is proposed. Finally, a comprehensive energy demonstration project is taken as an object to evaluate the implementation effect of the intelligent operation and maintenance business of the demonstration project, and the evaluation results are analyzed, targeted improvement and optimization measures are proposed, and the practicability and effectiveness of the proposed method are verified.