This study comprehensively evaluates the subsequent utilization and soil fertility improvement of newly added cultivated land in Beijing, aiming to provide a theoretical basis and reference for subsequent site-specific precision amelioration and classified management. Through questionnaire surveys of approved projects and tracking of soil organic matter, the management modes, utilization levels, and fertility enhancement of the newly added cultivated land were systematically analyzed. The results indicate that 94.3% of the surveyed plots have been put into production, with management and protection entities exhibiting a diversified pattern involving town governments, village collectives, and construction units. The subsequent utilization of newly added cultivated land was categorized into three types: high-efficiency utilization, medium-efficiency utilization, and low-efficiency/non-utilization. Production utilization and targeted fertilization effectively enhanced soil organic matter content; however, the organic matter content in 40.7% of the plots remained below the threshold of 8 g/kg. In conclusion, while the initial utilization of newly added cultivated land in Beijing is promising, the cultivation cycle of soil from generation to maturity is relatively long, and its sustainable utilization still faces challenges, and the utilization efficiency is differentiated. Therefore, future efforts should focus on improving infrastructure and management mechanisms, promoting large-scale management through the consolidation of small plots into large ones, and implementing precise fertilization and improvement measures tailored to local conditions, so as to achieve sustainable and efficient utilization of newly added cultivated land.