Hybrid Pennisetum was used as raw material and extracted firstly by toluene-ethanol. Diethyl phthalate was used as the organic phase and added to the acidic lithium bromide solution with the sulfuric acid concentration of 0.05 mol/L to form lithium bromide hydrated molten salt-diethyl biphasic system. And then, the raw materials were placed in the biphasic system for hydrolysis to produce furfural(FF) and levulinic acid(LA). The effects of temperature, acid concentration, reaction time and organic phase volume on the yield of FF and LA were investigated.The experimental results showed that when the system was an acidic lithium bromide solution with the sulfuric acid concentration of 0.05 mol/L, the solid-to-liquid ratio of the extracted Pennisetum to the acidic lithium bromide volume was 1:20(g: mL), the volume of the diethyl phthalate was 20 mL, 1 g of the extracted Pennisetum was used as raw material, the reaction temperature was 160 ℃, and the reaction time was 120 minutes, the yield of FF was 65.17%, and the yield of LA was 10.48%. Under the same conditions, when the acidic lithium bromide volume was 30 mL and the organic phase volume was 10 mL, the yield of FF was 60.74%, and the yield of LA was as high as 41.30%. More than 80% of FF was dissolved in the organic phase, and more than 90% of LA was dissolved in the hydrated molten salt phase. The technology could realize the synchronous preparation and effective separation of FF and LA, and could effectively reduce production costs and shorten the process flow, which provided a reference for the simultaneous preparation of furfural and levulinic acid from cellulosic biomass.