The invention discloses a supplier evaluation method based on a quantifiable index system. The supplier evaluation method comprises the steps of: determining evaluation indexes used for evaluating supplier levels based on actual service data, wherein the evaluation indexes comprise offer, quality, fulfillment, service, technology, finance and social responsibility; acquiring detailed data corresponding to actual services, and calculating to obtain an evaluation value of each evaluation index according to a preset algorithm; utilizing an entropy method to calculate weight corresponding to each evaluation index; and adopting a TOPSIS scoring method and a GRAY scoring method for scoring suppliers, and endowing different scoring coefficients for calculation to obtain TOPSIS and GRAY comprehensive evaluation results. Therefore, the supplier evaluation method based on the quantifiable index system can be used for constructing a reasonable and effective supplier evaluation index system, the evaluation can reach the degree of quantifiable calculation, and finally accurate and reliable evaluation of the suppliers is realized.