The invention discloses an optimized utilization method for light naphtha. According to the method, firstly, the light naphtha passes through an adsorptive separation unit, adsorbed remaining oil rich in iso-alkanes and desorbed oil rich in n-alkanes can be obtained separately, and the desorbed oil can directly serve as an ethylene cracking stock; and the adsorbed remaining oil then passes through a rectifying unit, and a gasoline mixture rich in iso-C6 and high-purity isopentane can be obtained separately. According to the optimized utilization method for the light naphtha, an adsorptive separation-rectifying separation coupled process is adopted, the adsorptive separation unit uses a high-performance adsorbent, and the adsorbent can be used for achieving the distinct partition of the n-alkanes and the iso-alkanes according to molecular dimension difference, so that the selectivity is high, and the regeneration effect is good; and compared with the traditional multi-tower precise rectification, the method has the advantages that the energy consumption is low, and both the product purity and the product yield are relatively high.