A round roller crusher comprises a transmission system and a control system. The transmission system comprises a speed reducer and a driving wheel. The driving wheel is connected with a driven wheel through a transmission belt. The driven wheel is mounted at one end of a fixed roller, and a gear is arranged at the other end of the fixed roller. The fixed roller is in linkage and transmission with a movable roller through the gear. The control system comprises an adjusting screw, adjusting bolts, compression springs and bearing pedestals. The bearing pedestals at the two ends of the movable roller are arranged between a shaft seat rack cover plate and a shaft seat rack bottom plate through guide rail devices, and the bearing pedestals at the two ends of the fixed roller and a supporting column are rigidly fixed through bolts. The two rollers are driven by the drive gear to rotate, the distance between the two rollers can be adjusted through the adjusting bolts and the compression springs, so that material particles suitable for being crushed by the crusher are wide, and the crusher is simple in structure, convenient to maintain and long in service life.