The invention relates to a method for predicting the crack of a reservoir stratum of a granite buried hill, and the method comprises the following steps: 1), carrying out the ancient landform recovery of the top surface of a buried hill in a target region; 2), carrying out the interpolation of the top surface (the ancient landform) of the buried hill after the last leveling, and generating an ancient landform contour map; 3), recognizing the trench and ridge of the ancient landform of the buried hill; 4), carrying out the depiction and extraction of the trench and ridge distributed regions; 5), predicting a crack growth region. The method is used for the prediction of the crack of the reservoir stratum of the granite buried hill, and predicting the crack growth region through the recognition and extraction of the trench (higher) and ridge (lower) of the ancient landform of the buried hill. Moreover, a triangle method is employed for recognizing the trench and ridge of the ancient landform in a process, thereby enabling the trench and ridge prediction to be standardized, and enabling the crack prediction workload, compared with the workload of a conventional geologic work method, to be greatly reduced.