Abstract: According to characteristics of complexity of health status evaluation of large electromechanical equipment, and nonlinear, fuzzy and grayscale of the impact factors, the paper constructed evaluation index system of health status of equipment from three aspects of product quality, operational states and historical data, and designed stratified comprehensive evaluation model of health status of equipment based on fuzzy-gray-variable weight summation. Mine-used belt conveyor was selected to verify the comprehensive evaluation model, and the results showed that the actual operation status of equipment was consistent with the results of assessment derived using the model. The comprehensive evaluation model has an important actual significance for health status evaluation for large electromechanical equipment and safety production.