To clarify the characteristics of soil fertility changes in the cultivated land, and to further enhance soil productivity, the dynamic changes of comprehensive evaluation indicators of cultivated land were analyzed, including organic matter, alkali-hydrolyzable nitrogen, available phosphorus, and available potassium, based on the monitoring data of main soil nutrient indicators from the second soil survey in 1984 and 20 long-term monitoring sites from 2010 to 2022. The results indicated that from 2010 to 2022, the soil organic matter content ranged from 17.82 to 21.70 g/kg, the alkali-hydrolyzable nitrogen content varied from 91.9 to 138.9 mg/kg, the average available phosphorus content ranged from 18.68 to 32.13 mg/kg, and the average available potassium content varied from 183 to 230 mg/kg at the monitoring sites. Over the past 13 years, the soil organic matter and alkali-hydrolyzable nitrogen contents at the monitoring sites showed an overall trend of fluctuating increase, the average available phosphorus content exhibited a slow decline followed by a gradual stabilization trend, and the average available potassium content showed fluctuating changes while maintaining a relatively stable trend. The overall soil nutrient levels tended towards balance, and the overall soil fertility level maintained a continuous upward trend.