In order to understand and master the water quality status of sea cucumber aquaculture， a multi-level fuzzy evaluation method using a fusion of triangular fuzzy number and analytic hierarchy process was used to evaluate the water quality of sea cucumber farming. Firstly， the water quality key factors were classified based on their positive and negative effects on sea cucumber growth during the farming process， and a “positive/negative correlation factor fuzzy reasoning system for sea cucumber aquaculture water quality” was designed based on the two categories of key factors. Secondly， the two fuzzy reasoning systems were used as inputs for the first level fuzzy system， and the results were used as inputs for the second level fuzzy system. The final water quality evaluation results were obtained through the second level fuzzy system based on the first level positive/negative correlation factor reasoning results. During the fuzzy reasoning process， the triangular fuzzy number analytic hierarchy process was used to assign weights to the sea cucumber water quality key factors in order to improve the accuracy of the evaluation results. Finally， this method was compared to the single-level fuzzy evaluation system and ANFIS fuzzy evaluation system using a fusion of triangular fuzzy number and analytic hierarchy process for evaluating the water quality of sea cucumber aquaculture. The results showed that the three methods produced consistent evaluation results. The multi-level fuzzy evaluation method for sea cucumber aquaculture water quality using a fusion of triangular fuzzy number and analytic hierarchy process reduced the number of fuzzy rules from the original 243 to 45， alleviating the problem of dimensionality catastrophe. Moreover， it requires less parameter tuning and training compared to the ANFIS fuzzy evaluation system and occupies fewer system resources. These results indicate that the fusion of triangular fuzzy number and analytic hierarchy process is more suitable for water quality evaluation and management in sea cucumber aquaculture.