The invention relates to a dissolving printing technique of an elastic fiber fabric, belonging to the technical field of preparing special woven fabric. The dissolving printing technique comprises the steps of winding, loosening, pre-setting, pretreatment, printing, aging, washing, dehydration, drying and setting sequentially, the printing consists of dyeing and dissolving treatment, the solution for dissolving treatment is mixed with a dyeing auxiliary sodium alginate paste for use, after the solution and the sodium alginate paste are evenly mixed, the elastic blended fabric is dissolved into designed flower types and patterns through a mould, flat scream printing or manual smearing, and the solution comprises the following compositions in percentage by weight: 88% of N,N-dimethylformamide, 2% of dibutyltin dilaurate, and 10% of mineral oil. By adopting the technical scheme, the elastic fiber fabric has the advantages of excellent in breathability, low processing cost and good three-dimensional effect, and is convenient and fast to operate.