The invention relates to an improved roller type crusher. The crusher comprises a machine frame, a first roller wheel, a second roller wheel matched with the first roller wheel and a driving device used for driving the first roller wheel and (or) the second roller wheel to rotate; the first roller wheel is arranged above the second roller wheel, a first roller pressing surface is arranged on the first roller wheel, and a second roller pressing surface is arranged on the second roller wheel; and the first roller wheel is provided with a movable pressing frame used for exerting pressure on the first roller wheel, and the length of the first roller pressing surface in an axial direction is smaller than the length of the second roller pressing surface in the axial direction. According to the technical scheme, even if abrasion occurs in use, a reasonable gap can be formed between the first roller wheel and the second roller wheel, so that uniform crushing of materials is realized, and the first roller wheel and the second roller wheel have the advantage of being long in service life.