The invention discloses a method for extracting data information in the drainage basin boundary. From boundary points, the features of point judgment are effectively combined, the purpose for quickly judging data points in the drainage basin is achieved, and an encryption algorithm is provided for the problem of low accuracy in identification of the boundary points, support for quickly extracting effective data information in the drainage basin is provided for a distribution type hydrological model, and calculation time is greatly saved. The method for extracting data information in the drainage basin boundary has the advantages of simplicity in implement, high accuracy, short time in calculation, high operability and the like, is an ideal method for extracting information of the drainage basin for hydrological model researchers and has promising application prospect.