Fuel cell centrifugal air compressor and fuel cell system

The utility model provides a fuel cell centrifugal air compressor and a fuel cell system, relates to the technical field of air compressor equipment, and solves the technical problems of complex structure and large size of an air compressor caused by an external interstage cooling pipe in the prior art. The fuel cell centrifugal air compressor and the fuel cell system comprise an air compressor body, wherein an interstage pipeline for communicating a first-stage compression area with a second-stage compression area is arranged in a shell of the air compressor body; an air inlet channel is arranged between the interstage pipeline and the motor cavity, an air outlet channel is arranged between the motor cavity and the air suction chamber of the first-stage compression area, and high-pressure air compressed in the first-stage compression area can be led into the second-stage compression assembly through the interstage pipeline. And high-pressure gas compressed by the first-stage compression area can enter the mo