Passive exoskeleton is a wearable walking aid equipment. Provide hip joint and knee joint auxiliary force for users with weak lower limb muscle strength, so as to reduce the energy consumed during walking and improve the quality of work and life. Without battery energy, the gravity of the human body is used to replace the driving force of the motor to guide the user to walk in a natural gait. The product has no motor drive, so as to eliminate the sound generated by motor operation and the discomfort caused by fixed mode walking, and maintain the user‘s mental health. In line with ergonomic design, it is suitable for indoor, outdoor, up and down stairs and other environments, almost unaffected by weather conditions.