Taking the Beibu gulf urban agglomeration in Guangxi as an example, this paper uses InVEST model evaluation method, afforestation space suitability evaluation method and ArcGIS overlay analysis method to quantitatively analyze the land use type status, habitat quality level and habitat degradation degree of the study area, as well as the scale of suitable afforestation land for planning, and accurately identify the priority area and general area of land greening space according to the classification of habitat quality. The results show that: The main land use types in the study area are forest land and cultivated land, accounting for 87.56% of the total area. In 2020, the average habitat quality index in the study area was 0.3930. The area of medium, good and excellent habitat quality accounted for 44.34%, and the area of poor and poor habitat quality accounted for 55.66%. The average value of habitat degradation index was 0.3199, and the habitat degradation was a more serious grade. The overall status of habitat quality in the study area belongs to the medium deviation level. The number of planning patches suitable for afforestation and greening space use control is 48967, and the planning area is 30091hm². The priority area of ecological construction and land greening in the study area is 24276hm², and the general area is 5815hm². The evaluation and delineation of suitable space for afforestation and greening involves multi-dimensional driving forces such as policies and regulations, ecological needs, scientific and technological support, economic society, international responsibility and public participation, and the comprehensive driving effect is significant. By evaluating and delimiting the space suitable for afforestation and greening land in urban agglomerations and incorporating it into the 'one map' of land and space planning for refined use control, and implementing the integrated comprehensive monitoring of urban and rural greening space 'sky and land', it is helpful to solve the problem of land use for ecological construction projects in urban agglomerations in China and the short board of information management of 'afforestation and greening landing map', so as to provide support for the ecological construction of urban agglomerations to achieve' legal compliance, precise implementation and intelligent management'.