The invention relates to a spraying type loose fiber treatment device, belonging to the technical field of loose fiber treatment. The spraying type loose fiber treatment device comprises a box body, a treatment net, rollers and a spraying mechanism located in the box body, wherein four edges of the box body are sealed and an inlet and an outlet are formed in front and rear ends of the box body; the treatment net is driven by a driving roller and enters from the inlet and exits from the outlet; a plurality of groups of rollers are arranged along the movement direction of the treatment net; the rollers comprise upper rollers and lower rollers, and the upper rollers and the lower rollers are located above and below the treatment net respectively; the middle axis of each upper roller is staggered from the middle axis of each lower roller; the middle axis of each upper roller penetrates through the corresponding lower roller, and rotary directions of the upper rollers and the lower rollers are opposite; and a treatment solution in the spraying mechanism is sprayed downwards from the upper side of the treatment net. The spraying type loose fiber treatment device provided by the invention is applied to procedures of dyeing, color fixation, washing, softening and the like of loose fibers and has the advantages of low energy consumption, great treatment amount, good treatment effect and the like.