A high-speed dual turbo machine enabling cooling thermal equilibrium. The high-speed dual turbo machine maximizing the cooling efficiency thereof by compressing and discharging external air suctioned therein at both ends, cooling an air compressor in a suction air-cooling method, decreasing a flow path of air for cooling the inside of the dual turbo machine and the air compressor, and optimizing the flow path. Accordingly, the present invention uses the suction air-cooling method and guides the flow of air for cooling the turbo machine through a specific path, so that it 15 maximizes the efficiency and durability of the turbo machine, the cost reduction owing to the structural simplification of the turbo machine, and the easiness of maintenance by preventing an increase in temperature of the inside of the turbomachine casing (100) and the air compressor (200).