Taking the kilometer grid as the evaluation unit, a land ecological security measurement index system is constructed based on the PSR-NES(pressure - state - response and economy - environment - society) model, and the catastrophe progression method is used to measure the land ecological security status of Guangzhou from 2010 to 2020. The results showed that the spatial heterogeneity of the land ecological security level in Guangzhou is relatively obvious, which shows the overall distribution pattern is “low in the middle and high around”.From 2010 to 2020, the level of land ecological security in Guangzhou declined first and then improved, among which, the level of land ecological security in the northern ecological conservation area showed a downward trend, the situation of land ecological security in the southern ecological adjustment area gradually improved, and the situation of land ecological security in the central built-up area was not optimistic. The development of cities and towns should try to avoid encroaching on areas with a high level of land ecological security, measures such as zoning management, scientific layout of production, living, and ecological spaces, optimization of industrial structure, and strengthening of ecological land protection should be adopted to continuously improve the ecological security of land.