As one of the clean energy utilization forms, wind power plays a positive role in promoting energy transformation and realizing the double-carbon goal, and wind power generation has been vigorously developed. Wind turbine is an important equipment in the process of wind power generation and wind farm, and its reliable operation should be ensured. In this paper, taking an actual wind farm as an example, the annual failure time of its direct-drive wind turbines is analyzed, and its failure types are sorted out. The causes of failures are analyzed, and the measures to improve the reliability are put forward to provide reference for the safe and stable operation of wind farms.