The present invention discloses an abutilon fiber preparation method, and belongs to the field of abutilon fiber preparation. The method is as follows: reeling off silk from abutilon, mixing the silk with obtained peach syrup, using an iron wire coated with a film to tie tightly, cutting the top of a wrapper to form a small opening, repeatedly rinsing with ethyl acetate, sealing and banding with a film for placing for a few days, cutting the bottom of the wrapper to form a small opening to let a liquid to naturally flow out from the wrapper, then taking the abutilon silk for soaking for three times respectively with dilute sulfuric acid, hydrogen peroxide and a sodium hydroxide solution, washing the abutilon silk with deionized water for three times until the abutilon silk is neutral, naturally drying in air, and spinning to form fiber to obtain abutilon fiber. The beneficial effects are that: the preparation method is simple, the cost of the preparation method is more-than-5% lower than that of other methods, degumming speed is fast, environmental pollution is less, the resulting product is good in quality, the lignin content obtained by the method is more-than-10% lower than lignin content obtained by other methods, and gum content is low.