The invention discloses an organic waste gas microemulsion absorbent, and a preparation method and application thereof. The absorbent comprises the following components in percentage by mass: 99.8 to 99.4 percent of water, 0.01 to 2 percent of surfactant, 0.05 to 2 percent of aid and 0.1 to 2 percent of inorganic salt. The preparation method comprises the following steps of: dissolving the surfactant with the water to obtain solution of surfactant; dissolving the aid and the inorganic salt in the water to obtain solution of aid; and mixing the solution of surfactant and the solution of aid and continuously stirring the mixed solution at the same time to obtain the organic waste gas microemulsion absorbent. The organic waste gas microemulsion absorbent is suitable for treating organic waste gases, and has the advantages of broad raw material sources, low cost, low saturated vapor pressure, non-toxicity, stable chemical properties, less corrosion to equipment, high organic waste gas removal efficiency, no need of pre-treating the waste gases, less investment, low running cost and the like; and the saturated absorbent can be recycled so as to realize the comprehensive utilization of resources.