Exercise assist robot is a lightweight wearable lower limb power-assisted exoskeleton designed for daily fitness training, outdoor hiking, endurance workout and leg rehabilitation exercise. Made of high-strength flexible composite materials with ergonomic wrapping design, this exercise assist robot closely fits human leg contours without limiting natural movements such as walking, climbing, downhill and squatting. Equipped with mini real-time gait sensors and multi-speed adjustable adaptive servo drive system, it can automatically identify flat ground, uphill slopes and downhill roads, and output matched auxiliary torque to hip and knee joints to share body weight and sports equipment loads. It rationally distributes lower limb stress, relieves severe muscle soreness and long-term knee abrasion caused by long-time exercise, optimizes standard bionic gait and effectively prolongs continuous exercise time to avoid premature fatigue. The streamlined foldable structure supports quick donning and portable storage in sports backpacks, reaching IP54 dustproof, sweat and splash-proof standard to adapt to all kinds of indoor and outdoor sports scenes. Fully adjustable soft padded elastic straps fit users of different heights and leg circumferences, without tight squeezing or skin friction redness during long-term training. Matched with detachable slim lithium batteries, it provides stable uninterrupted power assistance throughout the whole exercise process without extra weight burden. Bionic flexible joints completely follow human natural bending tracks, with simple one-touch control easy for fitness lovers, amateur sports enthusiasts and postoperative rehabilitation trainers to operate. Built-in overload protection, balance maintenance and emergency stop safety modules effectively prevent slip, sprain and secondary injuries during high-intensity exercise. This multi-scenario exercise assist robot realizes smooth human-machine motion coordination, greatly improves long-time training comfort and enhances overall exercise endurance while protecting lower limb joints from overload damage.