We developed a microemulsion additive for increasing production by imbibition stimulation in low-permeability tight reservoirs, based on the integrated construction method of "compression-injection-recapture" and with the goal of improving the performance of fracturing fluids. The major raw ingredients were anionic surfactant SY-1 and methyl 9-octanoate MS-9, and the phase behavior was explored by fitting a ternary phase diagram and optimizing the formulation using orthogonal tests. The microemulsion's average particle size, according to the results of indoor experiments, is 70.5 nm. It can stabilize under conditions of high-speed centrifugation (8000 rpm) and prolonged standing (180 days); it can reduce the interfacial tension to the order of 10-4-10-3 mN/m; it can reduce the contact angle by approximately 45°; it can maintain the high interfacial activity after 8 adsorptions with the core powder; it has strong anti-sorption ability; it has good compatibility with the fracturing fluid and can enhance the oil washing efficiency by 57~64% during the simulated fracturing entry stage. During the simulated fracturing well stage, the imbibition displacement impact may be raised by 16%, and during the flowback stage, the crude oil recovery rate can be increased by 32.6%. In conclusion, the microemulsion has high application prospects and can be employed as a fracturing fluid additive to boost the crude oil recovery rate throughout the entire fracturing construction process.