The invention discloses a uniform cutting pressure permeability increase gas extraction method for a composite geological structure coal seam. The method comprises the following steps: finding a main geological structure of coal seams on a geological structure map of a mine, and determining geological structure ranges according to geological structure parameters marked on the geological structure map of the mine; according to the geological structure ranges, drilling hydraulic cutting holes 2 in coal seams controlled by the geological structures 3, and performing hydraulic cutting gas extraction; drilling hydraulic fracturing holes 1 in coal seams among the geological structures 3, and performing hydraulic fracturing gas extraction. The method has the technical effects that the advantages of large hydraulic fracturing influence ranges and good hydraulic cutting gap controllability are taken sufficiently, limits of composite geological structures to hydraulic fracturing in coal seal permeability increase are overcome, the difficulty that the permeability increase efficiency of a hydraulic cutting coal seam is relatively low is solved, efficient and uniform permeability increase of composite geological structure coal seams is achieved, and the gas extraction efficiency of the composite geological structure coal seam is improved.