The invention discloses a DC brushless motor driving controller for an electric mechanism, belonging to the technical field of electronic circuits. The invention is designed based on the analysis of the structure and the working principle of the DC brushless motor, and has the advantages in the volume, the power device is reduced from the original four power switch transistors to two, and the space volume occupancy is reduced by more than 30% compared with the existing modules; The invention has wide applicability, can change device arrangement mode according to requirement, and is more flexible in design. As that parameter of the invention are adjustable, the power adaptation can be chan by replacing fewer components accord to different power requirements in engineering application; Compared with the logic judgment circuit required by the existing H-bridge module, the logic judgment circuit design of the invention is simpler, and the number of chips used is less.