Abstract: In view of the current health needs, the analysis of the exoskeleton of firefighters fire water guns based on human biomechanics is carried out to provide a theoretical reference of universal significance to reduce the occupational injury of firefighters. Design and organize the simulation experiment under the test conditions of firefighters with fire water gun wearing and not wearing the exoskeleton, obtain the body movement information of firefighters under the working condition, and analyze the muscle activity and joint reaction force of firefighters wearing and not wearing the exoskeleton under the working condition. Compared with those without the exoskeleton, when the exoskeleton is worn, the activation degree of the right shoulder and back muscles decreases significantly, while the activation degree of the left muscles increases slightly, and the activation degree of both muscles tends to be balanced to avoid unilateral muscle fatigue. At the same time, when wearing the exoskeleton, the stress of the fire water gun exoskeleton on the left lower limb joint was improved. The unilateral placement of the water gun led to a slight increase in the lower limb joint torque, but the reaction force of the right glenohumeral joint decreased.

Key words: exoskeleton of fire water gun, human biomechanics, muscle activation, joint reaction