Lower limb power suit is a lightweight wearable bionic exoskeleton focusing on hip and knee power assistance, applicable to mountain hiking, long-distance walking, field operation and daily lower limb rehabilitation training. Built with high-sensitivity real-time gait sensors and high-response servo actuators, this lower limb power suit instantly identifies walking, uphill and load-bearing postures, and releases graded auxiliary torque to reduce the bearing pressure of thigh, calf and knee joints, effectively alleviating muscle soreness and physical fatigue caused by prolonged movement. The ultra-light high-rigidity composite frame comes with IP54 dustproof and waterproof performance, maintaining stable operation on mountain trails, damp woodlands and dusty construction sites. Fully adjustable soft binding straps fit users of various heights and leg circumferences, matched with interchangeable large-capacity lithium batteries to support all-day continuous use. Adopting flexible ergonomic joint design without movement restriction, this lower limb power suit is widely suitable for outdoor hikers, field surveyors, the elderly and rehabilitation patients with insufficient leg strength, realizing smooth human-machine coordination and greatly improving long-distance mobility comfort and endurance.