In order to evaluate the health status of prestressed concrete continuous rigid frame bridge accurately, a comprehensive evaluation method based on Analytic Hierarchy Process (AHP) and fuzzy theory was proposed. Firstly, the three-layer state evaluation index system (bottom-middle-top) of prestressed concrete continuous rigid frame bridge was established with the method of chromatography analysis, the grade division for index state of each layer and overall evaluation state was determined, and the quantitative index evaluation standard of each layer in the state evaluation system of prestressed concrete continuous rigid frame bridge was established. Secondly, the membership function of trapezoid and semi trapezoid was selected, the main steps of fuzzy comprehensive evaluation method of prestressed concrete continuous rigid frame bridge were established, and the calculation methods of constant weight, variable weight and evaluation vector of each index in the state evaluation system were proposed. Finally, the method was applied to the state evaluation of Qinjiang third bridge. The results show that the state evaluation method of prestressed concrete continuous rigid frame bridge proposed can evaluate the state of prestressed concrete continuous rigid frame bridge, the state of Qinjiang third bridge evaluated by this method presents "good", which is consistent with load test results. Feasibility and effectiveness of the proposed method are verified.