This invention discloses a method for decolorizing 3-chloropropene. The method comprises: passing 3-chloropropene through a fixed bed filled with solid alkali particles inside, performing solid-liquid phase chemical reaction on color Fe3+, Fe2+, Cu2+ and Cr2+ in 3-chloropropene on the surface of the solid alkali to form precipitates or colloids, adsorbing and filtering the precipitates or colloids by the solid alkali particles, performing neutralization reaction between free acids in 3-chloropropene and the solid alkali, and adsorbing free water in 3-chloropropene by the solid alkali. The method has such advantages as easy operation and good effect, and can be widely used in industrial production of 3-chloropropene.