In order to explore the physical and chemical properties of soil with different rocky desertification intensity and their correlation in Northwest Guangxi karst area, three typical karst areas, Chengjiang Township, Baima Township, and NATAO Township were selected to collect three sample plots of slight rocky desertification（SD）,moderate rocky desertification（MD）, intense rocky desertification（MD） and normal soil（CK） were analyzed. The results showed that the content of fine soil particles and coarse soil particles showed a decreasing relationship, and the strengthening of the intensity of rocky desertification intensified the coarse ossification of soil particles. With the strengthening of rocky desertification, soil bulk density increased, while total soil porosity and soil water content decreased. Soil total nitrogen content, total phosphorus content, total potassium content and organic matter content decreased with the increase of rocky desertification intensity. Soil total phosphorus content, total potassium content and total porosity are important factors to characterize soil properties with different intensities of rocky desertification in karst areas of northwest Guangxi. The research results can provide a scientific basis for the ecological environment management in the karst area of northwest Guangxi with different intensity of rocky desertification.