The quality of cultivated land is related to the sustainable development of agriculture. Based on 818 questionnaires from the Guangxi Autonomous Region,this paper explores and verifies the impact of a new round certification on farmers’ cultivated land quality protection behavior. The results show that this certification can effectively encourage farmers to adopt the behavior to improve soil fertility and nutrient balance and more protective tillage behavior. Specifically,land certification can increase farmers’ probability to apply organic fertilizer,soil-testing formula fertilizer and lime,and possibility to adopt straw returning,no-tillage and sub-soiling technologies. Considering the possible endogenous traits and connections between different farmland quality protection behaviors,this paper uses PSM models and Mvprobit models to conduct the robustness test,and the above conclusions are still supported. Further analysis shows the stagnation of policy effect of certification. Specifically,farmers holding certification for a long period are prone to adopt behaviors protecting cultivated land quality,compared with those with certification for a short period. Moreover,the impact of land certification on the quality protection of some types of arable land is negatively regulated by the experience of land adjustment,which is expected to weaken the incentive effect of the new round certification on land consolidation on farmers to apply organic fertilizer,lime and notillage technology.