Production method for compound color bulked filament

The invention provides a production method for a compound color bulked filament. The production method comprises the following steps: performing solution dyeing, spinning and bundling on a fiber-forming polymer, thereby respectively obtaining single-color filaments; respectively drafting and deforming the single-color filaments, cooling, and then obtaining single-color bulked filaments; after adjusting tensile force of the single-color bulked filaments in various colors, performing net stranding; and spooling, thereby obtaining the compound color bulked filament. The compound color bulked filament obtained according to the production method provided by the invention is a novel compound color bulked filament; single colors of weaved textile of the compound color bulked filament are clearly distinguished; the style is unique; according to the production method provided by the invention, the novel compound color bulked filament is produced by adopting a single-step method; the process is short; the production ef