The AGIBOT D1 Ultra is an industrial-grade compact quadruped robot with IP54 dust and water resistance for harsh environments. Sharing the D1 platform form factor, it runs at up to 3.7 m/s with 48 N·m peak joint torque, 5 kg payload, and 200-hour stable operation in extreme conditions. Its core components feature sealed protection and anti-corrosion treatment, and the vacuum press-formed aluminum alloy shafts improve durability. Standardized expansion interfaces and an open SDK support integration of LiDAR, depth cameras, RTK, and 4G/5G modules for security patrol, inspection, emergency rescue, and research applications.