This paper introduces the fuzzy mathematics theory, through the comprehensive analysis and research to the air compressor system and the influence factor, constructs its hierarchical evaluation index system, and establishes the overall running state evaluation model on this basis. In order to solve the problem of subjective or objective weight distribution of evaluation indexes at all levels, an improved method of calculating weights is put forward to improve the application of multilevel fuzzy comprehensive evaluation method in equipment state evaluation, to make the results more scientific and objective. Finally, a certain air compressor is evaluated, and the result can reflect the actual running state of the air compressor, which verifies the validity and reliability of this method.