The invention belongs to the technical field of oil exploitation, and particularly relates to a method for predicting the water drive swept radius of an oil field. The method for predicting the waterdrive swept radius of the oil field comprises the following steps that basic parameters are obtained; the total injected water amount of a stratum at one time is calculated; the ineffective water injection proportion coefficient a is obtained, and accordingly the actual stratum total effective injected water volume is obtained; the water drive area is obtained; according to the piston type water drive oil theory, the equivalent circular water drive area and the equivalent circle radius r are obtained; due to anisotropism of a reservoir stratum, the actual oil deposit is non-piston type displacement of reservoir oil, accordingly, the water drive swept radius is corrected, and the oil well water content and the single-well set average water content are obtained; and the correction factor f is obtained; and the water drive swept radius R is equal to the product of r and f. According to the method, very important guidance significance is achieved for reasonable oil water well parameter allocation, production system adjustment and oil water well scheme adjustment in combination of a tracer agent, crack monitoring, a production and injection profile and other means.