Reactive dye substituted by benzene-containing sulfonamide and derivative of benzene-containing sulfonamide, and preparation method of reactive dye

The invention relates to the field of reactive dye, and particularly relates to a reactive dye substituted by benzene-containing sulfonamide and a derivative of the benzene-containing sulfonamide, anda preparation method of the reactive dye. The reactive dye substituted by the benzene sulfonamide and the derivative of the benzene sulfonamide has a structure represented by a general formula I. Inmolecules of the reactive dye, benzene sulfonamide and substituted benzene sulfonamide groups are directly connected with halogenated s-triazine molecules, and the electron-cloud density of carbon atoms on a triazine ring is reduced through an electron-absorbing effect, so that a nucleophilic substitution reaction occurs easily, therefore, reaction activity of the triazine structure is equivalentto reaction activity of aniline ethyl sulfonyl sulfate, the reaction rate of the dye at 60 DEG C is equivalent to the reaction rate at 90 DEG C, and energy-saving dyeing under mild conditions can be realized. In addition, the dye has high light fastness and has a wide application prospect.