Abstract: In recent years, China's wind power industry has developed rapidly. In the face of the upcoming wave of wind power decommissioning and renewal, it is of great significance to establish an evaluation system that is conducive to the decommissioning management of wind farms, conduct a scientific evaluation of the comprehensive effectiveness of wind farms, and understand the operation status of wind farms. This paper conducts research on the comprehensive effectiveness evaluation of wind farms. In view of the operation characteristics of wind farms, firstly, an evaluation index system for the effectiveness of wind turbines is constructed from three aspects: power curve, availability, and reliability, with the goal of evaluating the power generation efficiency of the units within the farm. Subsequently, an evaluation index system for the comprehensive effectiveness of wind farms is constructed from four aspects: wind resources, operation capacity, power loss, and economy. Finally, taking a domestic wind farm as a case, the multi-level fuzzy comprehensive evaluation method is used to evaluate it. The results show that this evaluation system can intuitively reflect a series of problems existing in the wind farm, such as the relatively high offset rate of the power curve of old units, the capacity availability being lower than the industry average, and the operation and maintenance costs per unit capacity and the cost per kilowatt-hour in the economic dimension significantly affecting the comprehensive score. At the same time, it also has a certain guiding role in the selection of disposal methods for wind farms that are about to reach their operation.