Dyeing promoter for reactive dye and using method of dyeing promoter

The invention discloses a dyeing promoter for reactive dye. The dyeing promoter comprises ethylenediaminetetraacetic acid ionic salt, specifically at least one of ethylenediaminetetraacetic acid tetrasodium salt, ethylenediaminetetraacetic acid disodium salt, dipotassium ethylene diamine tetraacetate, tripotassium ethylenediaminetetraacetic acid, ethylenediaminetetraacetic acid dilithium salt, ethylenediaminetetraacetic acid calcium disodium salt, ethylenediaminetetraacetic acid disodium zinc salt tetrahydrate and ethylenediaminetetraacetic acid ammonium salt. The invention further discloses a using method of the dyeing promoter. According to the method, the ethylenediaminetetraacetic acid ionic salt is adopted as the dyeing promoter of inorganic salt, the dye-uptake and fixation rate of reactive dyeing can be remarkably improved, the use amount of dyeing promoter neutral inorganic salt can be reduced, traditional reactive dyeing equipment is not required to be transformed, and dyeing technical parameters of various reactive dyes are not changed, so that the environment-friendly effect is improved, the production cost is reduced, and the environment-friendly low-salt reactive dyeing is realized.