The invention relates to a roller for a mixed row cutting tooth coal winning machine. The roller comprises a roller hub, an end disk, pickaxe-shaped cutting teeth and a square connecting sleeve, wherein the roller hub is trapezoidal; the roller hub is provided with a diameter-variable helical blade; the front part of the diameter-variable helical blade is provided with 1 to 2 rows of pickaxe-shaped cutting teeth arranged in a checkerboard way, while the rear part is provided with a plurality of disk cutter devices arranged in the checkerboard way; and the disk cutter devices comprise an upper connecting block, a lower connecting block and disk cutter cutting teeth; the upper connecting block and the lower connecting block are welded on the diameter-variable helical blade; and the disk cutter cutting teeth, the upper connecting block and the lower connecting block are integrated into a whole through bolts. According to the characteristics of compression resistance and low tensile resistance of coal beds, different axial coal dropping amounts along the roller, the gradual diameter change of the blade and the trapezoidal appearance, the coaling effect of the roller is improved by about 15 percent compared with that of the conventional cylindrical roller, and the lump coal cutting rate is improved by 7 percent; and the roller is suitable for mining low coal beds with the coal bed thickness of below 1.3m and the dip angle of between 0 and 25 degrees. The roller has the advantages of simple and compact structure, convenient operation, good cutting effect, good coaling effect and high rock breaking ability.