Exoskeleton leg is a single-side dual-side wearable lower limb power-assisted mechanical module made of ultra-light high-toughness composite material, specially developed to deliver targeted load reduction support for human hips and knees during walking, climbing, hiking and fitness exercise. This exoskeleton leg adopts an ergonomic leg-fitting curved frame with bionic flexible rotating joints that completely match the natural flexion and extension track of human legs, without restricting squatting, stepping and downhill movements. Equipped with built-in mini terrain sensors and intelligent adaptive servo actuators, it can real-time judge flat ground, uphill slopes and downhill roads, outputting adjustable auxiliary torque to offset body weight and backpack load, evenly dispersing concentrated pressure on thigh muscles and knee joints. It effectively relieves long-term muscle soreness and chronic joint abrasion, optimizes natural bionic gait and extends continuous activity endurance for outdoor travel, rehabilitation training and daily long-distance walking. The slim compact structure supports quick donning and foldable storage, reaching IP54 dustproof and splash-proof grade to adapt to indoor and outdoor all-weather use environments. Fully adjustable soft padded binding straps fit users of different leg circumferences and heights, avoiding squeezing friction and stuffiness during long-time wearing. Matched with lightweight detachable lithium batteries, it provides stable continuous power assistance without bringing extra heavy burden to the legs. Simple one-touch switch control lowers operation threshold, suitable for the elderly with insufficient leg strength, postoperative rehabilitation patients, outdoor hiking lovers and endurance sports practitioners. Integrated anti-overload protection, balance stabilization and emergency stop safety modules effectively prevent slips, sprains and secondary injuries on uneven terrain. This multi-scenario exoskeleton leg achieves smooth human-machine linkage coordination, greatly improves long-time wearing comfort and provides lasting reliable lower limb protection and power boost.