Abstract: To tackle challenges of limited seed box capacity in seeder and inefficiency of manual replenishment, an automatic supply system for seed box based on multi-sensor information fusion has been designed．System was built around an STM32F407ZGT6 embedded controller, incorporating a suite of sensors such as laser distance sensors, ultrasonic sensors, tilt sensors, and absolute encoders to enable high-precision real-time monitoring of seed box position and material levels．A hydraulic drive system was implemented for actuation unit, applying a fuzzy PID control algorithm to adjust hydraulic parameters in real-time, thereby addressing limitations of conventional PID algorithms in adapting to complex operational environments．Field tests revealed that system achieved minimal error during docking operations, with material levels monitoring accuracy of >95%．Fuzzy PID algorithm notably improved control system's robustness and dynamic response, while comprehensive solution demonstrates significantly higher replenishment efficiency and lower seed loss rates compared to traditional manual or semi-automatic methods．