Lightweight exoskeleton is a portable AI-powered lower limb wearable assistive robot crafted with high-strength lightweight composite materials, balancing ultra-low self-weight and reliable structural stability for multi-scenario daily and outdoor mobility support. This lightweight exoskeleton integrates miniaturized terrain sensing sensors and low-power adaptive servo drive modules, which can automatically identify flat ground, uphill and downhill road conditions, dynamically output graded auxiliary torque to hip and knee joints to ease lower limb load, relieve long-time muscle fatigue and reduce knee joint abrasion during walking, hiking and mild mountain climbing. The whole unit adopts streamlined slim structure without bulky components, supporting easy putting on and taking off, while reaching IP54 dustproof and splash-proof performance to cope with daily outdoor weather changes. Fully adjustable soft padded binding straps fit users of different heights and leg circumferences, paired with compact swappable lithium batteries to deliver all-day continuous assistance without excessive carrying burden. Ergonomic flexible joint design retains full natural limb movement range, equipped with simple one-touch intelligent control, friendly for elderly users with weak leg strength, postoperative rehabilitation patients and amateur hiking enthusiasts. Built-in anti-fall early warning, overload protection and emergency stop safety modules effectively avoid secondary injuries during long-term wearing. This versatile lightweight exoskeleton realizes smooth human-machine motion coordination, greatly improving long-distance walking comfort and extending mobility endurance without bringing extra weight pressure to users.