An exo suit is an ergonomically designed wearable mechanical auxiliary device used to reduce physical fatigue or assist rehabilitation training, mainly categorized into passive mechanical and active powered versions. Made from lightweight high-strength materials like carbon fiber and aviation aluminum alloy, it adopts a modular adjustable structure that fits various body shapes without limiting normal limb movement. Passive exo suits rely on elastic tension structures to share pressure on the waist and shoulders during frequent lifting, bending and long-hour standing tasks, effectively lowering the risk of lumbar strain and chronic occupational injuries in logistics, construction and manufacturing industries. Powered exo suits are equipped with precision sensors, servo drive units and intelligent control systems, which can capture users’ movement intentions in real time and provide auxiliary torque to help people with lower limb mobility disorders finish standing, walking and gait rehabilitation training. Most exo suits integrate safety functions including emergency stop, anti-fall balance protection and overload locking to guarantee reliable operation in various scenarios. With mature technology and commercialized production, the exo suit has become a practical intelligent tool for workplace protection and medical rehabilitation, effectively improving operational efficiency and helping mobility-impaired users regain basic mobility and confidence in daily life.