The invention discloses a method for producing and manufacturing scaly brush filaments and belongs to the technical field of brush filaments. The method comprises the following processes of producingundrawn brush filaments having certain cross-sectional shapes, conducting pretreatment on the undrawn brush filaments in the previous step before stretching, and conducting stretching and heat settingon the undrawn filaments treated in the previous step to obtain scaly fibers after the undrawn brush filaments are stabilized, wherein the pretreatment before stretching specifically includes the steps of alkali etching, washing and lubrication. The provided scaly brush filaments not only have relevant characteristics of animal fibers, but also have excellent performance of chemical fibers, defects in the prior art are made up for, current situations in a background technology are improved, media can be better extracted and accommodated, and the method is suitable for makeup brush filaments.