The invention relates to a continuous loose fiber dyeing machine. The continuous loose fiber dyeing machine comprises a dye vat; a mechanism which is fitted with the dye vat and used for conveying loose fibers is a double mesh belt dyeing conveying mechanism, and the double mesh belt dyeing conveying mechanism comprises two closed mesh belts (namely, a ring mesh belt A and a ring mesh belt B) and transmission components which are respectively in transmission fit with each ring mesh belt; two ring dyeing mesh belts in the dye vat are in clearance stacking fit with each other, the two ring dyeing mesh belts respectively fitted with the inlet end and the outlet end of the dye vat respectively form a duckbilled input port and a duckbilled output port, and the two ring dyeing mesh belts arranged outside the dye vat are respectively fitted with the respective transmission components so as to form a circular transmission. The invention has the prominent and substantive effects as follows: because the loose fibers are clamped and then sent to the dye vat for dyeing and the loose fiber is thin, the loose fiber is easy to be dyed completely; and with the help of shower pipes, the dye permeability of the loose fibers is improved, and little dyes are taken away, therefore, the dye consumption is saved.