The invention relates to micro-emulsion for increasing flow-back rate of fracturing fluid. The micro-emulsion consists of an ethyoxyl Gemini quaternary ammonium salt cationic surfactant, a nonionic surfactant and an additive. The micro-emulsion disclosed by the invention has the characteristic of being mixable with oil-water, the wetting condition of a rock core can be improved to be neutral mildly-hydrophilic, the surface tension is improved to be 25mN/m to 28mN/m, and the surface tension and interface tension of working liquid are obviously reduced, so that capillary pressure is reduced, start pressure difference is reduced, the flow-back efficiency of the working liquid is remarkably increased, a stratum is prevented from damages of the working liquid, and an effect of stable yield increment of an oil gas well is achieved.