Abstract: An energy-saving pneumatic barrier gate device comprises a machine, having an actuating portion, an electronic control portion, and a gas supply portion connected to an air compressor; a shaft assembly and two switch components, installed on the actuating portion; a barrier component, installed on one end of the shaft assembly; and a driving assembly, installed on the other end of the shaft assembly. The shaft assembly controls execution of swinging of the barrier component. The two switch components control cessation of swinging of the barrier component. The driving assembly controls the movement of the shaft assembly and barrier component, and includes a linkage rod pivoted to the shaft assembly and two bellow pumps each having one end pivoted to a respective one of two ends of the linkage rod and the other end installed on a respective one of supports on an outer surface of the gas supply portion.