A pneumatic energy supplying power for ultra-high voltage equipment, including a low voltage unit, an ultra-high voltage unit, and a connection unit for connecting the low voltage unit and the ultra-high voltage unit is provided. The low voltage unit includes a conversion module of low voltage side used for converting an electrical energy into a mechanical energy, and a gas compression pump driven by the conversion module of low voltage side to compress gas and output compressed gas. The ultra-high voltage unit includes a pneumatic motor driven by the compressed gas, and a conversion module of ultra-high voltage side driven by the pneumatic motor to generate power and output a power for load to the ultra-high voltage equipment. The connection unit includes an insulating gas-conveying pipe connecting the gas compression pump and the pneumatic motor to convey the compressed gas.