Fiber extraction device and multistage fiber extraction device

The utility model discloses a fiber extraction device and a multistage fiber extraction device. The fiber extraction device comprises a motor and an extraction room (1), wherein a filament inlet and a filament outlet of the extraction room are respectively provided with a small filament guide roller, an extracting agent injection port is arranged on the sidewall of the filament outlet side of the extraction room, an overflow port is arranged on the sidewall of the filament inlet side, the fiber extraction device is characterized in that at least one pair of filament guide rollers is arranged in the extraction room, and a distance between the filament guide rollers is gradually reduced from a mounting end (11) of the extraction room to the outer edge of a rotating surface on a tail end (12) of the extraction room. According to the device, the amount of the filament guide rollers is reduced while the same extraction effect is realized, the volume of the extraction room is reduced, the cost is reduced, and the f