The utility model discloses a buffer stop is carried to the guillotine paper provides the rack in the steel sheet upper end that the second grade belt is close to one-level belt both sides, provides the gear on the rack of both sides respectively, provides the casing in the gear periphery, two gears just to and by the shaft hookup, the shaft both ends are passed the casing respectively and are formed integratively with the casing, wherein shaft one end is projected the casing and outer and install the handle, immobilization connection pole on the relative medial surface of casing provides the nut in the upper end of coupling rod, installs adjusting bolt in the nut, transversely provides the one dancer roll on the second grade belt of adjusting bolt lower end, is provided with the rubber layer at the dancer roll surface, is fixed with the base of guiding hole at dancer roll both ends, the assembly of adjusting bolt lower extreme in the base guiding hole, assembly one compression spring on adjusting bolt, the rubber layer of the outer periphery of dancer roll is to paper front end buffering, the dancer roll produces the elasticity removal at atress in-process can also simultaneously, further cushions the impulsive force to prevent that the paper front end from breaking.