The backpack frogman underwater thruster is mainly composed of battery components, control switches, propulsion motor components, cylinder tie straps, diving cylinders, etc. The propeller is fixed on the gas cylinder. By turning on the control switch, the propeller of the propulsion motor can be started to rotate to generate thrust, which can effectively save the physical strength of underwater personnel, increase the underwater forward speed, and expand the range of action of underwater personnel. It is mainly used for the propulsion of underwater operators.