Viscoelastic system constructed by functional Gemini surfactants and preparation method of viscoelastic system

The invention relates to a method for preparing a viscoelastic surfactant solution obtained by complexing a cationic surfactant and three anionic surfactants of different chain lengths. The anionic surfactants can be any one of sodium laurate (SL), sodium myristate (SM) and sodium palmitate (SP). The viscoelastic surfactant solution is prepared by compounding a Gemini surfactant with a hydroxyl as a main component and a small amount of anionic surfactants. The preparation of the surfactant solution comprises two main processes, namely compounding and testing the viscoelastic performance. Specifically, the Gemini cationic surfactant is prepared into a solution of a certain concentration and the solution is complexed with the anionic surfactants according to different ratios, so that the viscoelastic surfactant solution can be obtained.