The present disclosure relates to a cooking fume separation device and a fume exhaust device. The fume exhaust device includes the cooking fume separation. The cooking separation device includes a first bracket, a second bracket, a plurality of first separation plates and a plurality of second separation plates. The plurality of first separation plates are fixedly connected to the first bracket, the plurality of second separation plates are fixedly connected to the second bracket, the plurality of first separation plates and the plurality of second separation plates are staggered and spaced apart in an up-down direction, the first separation plate and the second separation plate partially cover each other to form a plurality of separation passages, and the first bracket and the second bracket are movably connected so as to adjust a size of each separation passage.