The invention provides a comprehensive energy-saving technology evaluation method based on order relation analysis and a grey correlation theory. Firstly, a comprehensive energy-saving technology evaluation index system is established; an order relation analysis method is applied to determine weight coefficients of comprehensive energy-saving technology evaluation indexes; basic data of to-be-evaluated energy-saving technologies are determined to form comparative sequences; grey correlation analysis in the grey theory is adopted to comprehensively estimate the energy-saving technologies to determine a grey correlation coefficient matrix of the energy-saving technologies; grey weighting correlation degrees of the energy-saving technologies are calculated according to a weight vector, whichis of the comprehensive evaluation index system and obtained by the order relation analysis method, and the grey correlation coefficient matrix which is of the energy-saving technologies and obtainedby adopting grey correlation analysis in the gray theory; and advantage and disadvantage degrees of the various energy-saving technologies are judged and compared on the basis thereof. According to the method, the multiple indexes are adopted for comprehensive evaluation, a evaluation conclusion is more objective and overall, and a decision-making method is provided at the same time for selectingan highly efficient and rational energy-saving technology by an energy-consuming enterprise or an energy-saving service company.