An energy-saving device for rapidly and infinitely compressing air includes housing, rotating shaft, spiral fan blade, power unit, transmission gear set, and fixing bracket, it is characterized in that the housing is connected with the fixing bracket, the rotating shaft with the spiral fan blade has upper and lower transmission gear sets, the power unit provided on the fixing bracket rotates the rotating shaft through the transmission gear set, so that a tornado-like airflow is generated in the space between the housing and rotating shaft, the devices can be stacked infinitely, so that the airflow is continuously accelerated to produce a powerful air thrust. The present invention can be widely used in aircraft and other vehicles, weapons, and protection and other aspects.