The invention relates to a method for alternatively dyeing and painting silk. The method comprises the following steps: preparing silk fabrics, an acidic dye or a reactive dye; employing the acidic dye or the reactive dye for dyeing and painting on the silk fabrics, performing complex formulation by using a mixed preparation before usage of the reactive dye, wherein the dyeing and painting method is carried out by alternatively dyeing and painting; drying the dyed and painted silk with a liner plate at temperature being 60-70 DEG C for 20-25 minutes; steaming the dried silk at temperature of 90-100 DEG C for 15-30 minutes; washing the dried silk by hot water at temperature of 60-70 DEG C for 35-40 minutes; then washing the dried silk for 20-25 minutes by normal temperature water; curing the rinsed silk by clear water at temperature of 90-100 DEG C for 5-7 minutes; wherein running speed for curing is 3-4 m/min, and drying the silk to obtain a finished product. In the dyeing and dye fixation technology, the prepared product has the advantages that a color fastness detection standard and an environmental protection index completely accord with a national standard.