The invention discloses a gradual change colorful yarn production technology. The gradual change colorful yarn production technology includes a dyeing process, a cotton blending process, an opening and cleaning process, a cotton carding process, a drawing and doubling process, a roving process and a spinning process, wherein at least three types of dyed cottons are dyed in the dyeing process, the at least three types of the dyed cottons form at least three strands of rough yarns different in color after the at least three types of the dyed cottons are respectively processed through the cotton blending process, the opening and cleaning process, the cotton carding process, the drawing and doubling process and the roving process, and the at least three strands of the rough yarns different in color form a gradual change colorful yarn after the at least three strands of the rough yarns different in color are processed in the spinning process. The gradual change colorful yarn production technology can obtain the gradual change colorful yarn by combining the more than two types of the rough yarns different in color and processing the more than two types of the rough yarns in the spinning process, and after the gradual change colorful yarn is woven into a knitted fabric or a knitted sweater, an indistinct irregular curve pattern can be presented, two colors foil each other, changes are abundant, and furthermore large color contrast can appear, a cloth cover is strong in layering sense, multicolored gloss is reflected, and personalization is strong.