The present invention discloses a lateral capsule rejection structure for capsule coffeemakers, and a capsule coffeemaker. The structure comprises an inclined unloading plate arranged inside a case for a capsule coffeemaker, a blocking plate arranged on a sidewall of the case, and a capsule collector arranged below the blocking plate; and a discharge port is formed on the sidewall of the case, and a top sidewall of the discharge port is movably connected to one end of the blocking plate. In the present invention, by providing an inclined unloading plate below the automatic compressing, rejecting and brewing device for capsule coffeemakers, the used capsules can automatically fall; and by providing a capsule collector outside the case of the coffeemaker, the user can readily observe the collection condition of the used capsules in the capsule collector, and the user can remove the used capsules in time and know the water accumulation level inside the capsule collector by visual check, so that it is convenient to avoid the overflow of water from the capsule collector, bacteria are hard to breed due to the adequate ventilation, and the excessive collection of the used capsules between the moving mechanisms, which fails the coffeemaker in brewing coffee, will not occur.