An autonomous refilling system for a mobile security robot is disclosed. The system includes a refill station having a fluid reservoir, a pumping mechanism, and a docking interface configured to align with a refill port on the robot. A sensor system verifies docking, while a fluid level sensor on the robot monitors onboard reservoir levels. A control module initiates and terminates fluid transfer based on docking status and fluid conditions. In various embodiments, the station incorporates redundant sealing, leak detection, thermal monitoring, and multi-reservoir support for different fluids such as water, invisible ink, or scent-based deterrents. The system may be integrated with a centralized management platform that coordinates refilling across multiple robots and stations.