In this paper, satellite sensing technology, the satellite remote sensing data of 30m DEM and 16m GF1 are used to retrieve the slope, slope aspect and rocky desertification in Zhenning, Ziyun and Guanling for the satellite remote sensing retrieval. Based on the sunshine data of Meteorological Station, the spatial distribution of PV utilization potential in rocky desertification area of three counties was analyzed by ArcGIS software, the suitable capacity of PV project was calculated, and the suitable suitability distribution of photovoltaic power station construction is got. The research shows that the suitable construction area of Guanling country is 149.6 km2, accounting for 42.3% of its total area, Zhenning is 85 km2, accounting for 24% of its area, Ziyun is 33.7%, and the suitable construction area is 119.1 km2. The total suitable installed capacity of the three counties is 3315.9 million kw, of which Guanling is 1402.5 million kw, Zhenning is 7.969 million kw, Ziyun is 1116.6 million kw. Precise and detailed extraction of the suitable area for photovoltaic construction and quantitative estimation of the installed capacity can provide scientific basis for exploiting solar energy resources in rocky desertification area.