he performance difference between polyester and cotton makes the recycle and reuse of the waste polyester-cotton blended textiles is complex. In the paper, hydrolysis method was used to the separation and recovery of waste polyester-cotton blended fabric, considering the different acid resistance of cotton fiber and polyester fiber and the characteristics of subcritical water. The effects of hydrothermal temperature, reaction time and hydrochloric acid concentration on the separation process were studied by using the polyester/cotton blended ratio of 80/20 waste fabrics as the raw material and HCL as catalysts, then the physicochemical properties of the products after hydrothermal reaction were characterized. The results indicated that the suitable hydrothermal process can be determined as follows: catalyst concentration of 1.5%, hydrothermal temperature of 150℃, and the reaction time is 3 h.The cotton fiber in blended fabric was hydrolyzed, and some of them hydrolyze to solid cellulose, the yield is about 48.21%; the other continues to hydrolyze to water-soluble carbohydrate. The recovery rate of polyester yarn after hydrothermal treatment is up to 96%, and the fracture strength is just reduced by 3%, which can be used directly. The hydrolysate containing water-soluble sugars can be recycled 5 times, which realizes the high value and green recycle of the waste polyester/cotton blended fabric.