KneeBO, a portable knee joint exoskeleton, is designed for lower-limb muscle training and walking improvement. This innovation provides strength support for individuals with knee joint degradation. With a lightweight design of just 1.5 kg and quick-release buttons, users can put it on within one minute, making it perfect for daily activities. KneeBO employs compliant control algorithms and an inertial measurement unit for automatic function switching and fluid movement tracking. It serves as an assistive mobility technology for gait training.