Abstract: The invention relates to a tuna skinning machine, in which at least one conveyor belt (3) is installed along a frame (1) in order to move tuna loins (4) which, as they move, are worked by vertical-axis brushes (7) moving horizontally, horizontal-axis brushes (16) moving vertically and vertical-axis cutters (24) moving both vertically and horizontally, the brushes being designed to skin the tuna and the cutters being designed to remove the dark meat. This structure can be repeated several times along the frame, with the aforementioned cutter (24) being replaced in the final structure by a brush (37) that completes removal of the dark meat. The conveyor belt (3) has an end gap (39) containing a lower brush (38) for cleaning the lower face of the loin.