Epidemic prevention emergency air supply and return disinfection device and epidemic prevention emergency system

The invention discloses an epidemic prevention emergency air supply and return disinfection device which comprises a shell, a gas flow channel is arranged in the shell, a gas inlet and a gas outlet are formed in the two ends of the gas flow channel respectively, and a disinfection system and a fan used for driving airflow to flow from the gas inlet to the gas outlet are arranged in the gas flow channel. The invention further discloses an epidemic prevention emergency system which comprises an air return opening located above the head of the human body, an air supply opening located below the head of the human body and the epidemic prevention emergency air supply and return sterilization device, an air return pipe is arranged between the air return opening and the air inlet for connection, and an air supply pipe is arranged between the air supply opening and the air outlet for connection; and under the action of the fan, airflow flows upwards to enter the air return port, and flows out upwards from the air sup