The invention discloses a method for confirming a wind direction field in a wind power station group. The method comprises the following steps of transforming a wind power station coordinate, and converting a wind power station longitude-latitude coordinate in the wind power station group into a simple two-dimensional coordinate; confirming a relationship among wind power stations, judging the sequence of passing through each wind power station by the wind, and sequentially carrying out recursive analysis toward the down wind direction according to the sequence; and confirming a relationship among wind directions in the wind power station group. According to the method for confirming the wind direction field in the wind power station group, method which is capable of relatively accurately analyzing the wind direction field in the wind power station group is provided for the constructors of wind power stations; and the method is capable of effectively solving the wind speed analysis errors generated when the wind directions in the wind power station group generate relatively large changes due to factors such as terrains, fans and the like, so as to provide guarantee for assessing the power generation ability of the whole wind power station group and then effectively decrease the analysis errors.