Machine room airflow circulation system

The invention discloses a machine room airflow circulation system. The machine room airflow circulation system comprises a machine room space, wherein the machine room space is divided into an upper floor space and a lower floor space by a floor, a plurality of server cabinets are installed in the space on the floor, a plurality of columns of air conditioners are installed in the space below the floor, the on-floor space comprises a closed on-floor cold channel and a closed on-floor hot channel, the under-floor space comprises an under-floor heat channel, an air supply grid and an air return grid are arranged on the floor, the under-floor heat channel is communicated with the on-floor heat channel through the air return grid, and an air supply outlet of the air conditioner is communicatedwith the on-floor cold channel through the air supply grid. The system is advantaged in that the cold air and the hot air of the machine room airflow circulation system form closed circulation withoutmutual influence, the coo