The invention discloses a wind turbine generator variable-pitch bearing bolt tightening method. The method includes the steps that (1) eight bolts at the 0-degree position, 45-degree position, 90-degree position, 135-degree position, 180-degree position, 225-degree position, 270-degree position and 315-degree position of a variable-pitch bearing are subject to first-time tightening according to the crossing method sequence; (2) the eight bolts on the variable-pitch bearing are averagely divided into eight zones through eight bolts; (3) the bolts in the eight zones are subject to regionalization first-time tightening according to the crossing method sequence; and (4) after first-time tightening of all bolts on the variable-pitch bearing is completed, second-time tightening of all the bolts is completed according to the sequence in the step (1) and the step (3), and finally final tightening of all bolts is completed according to the sequence in the step (1) and the step (3). According to the wind turbine generator variable-pitch bearing bolt tightening method, the regionalization tightening measure is taken, while the bolt tightening quality is guaranteed, the process is optimized, the labor intensity of workers is reduced, and potential safety hazards are eliminated.