Biological medicine cleaning workshop and air conditioning system thereof

The invention relates to a biological medicine cleaning workshop and an air conditioning system thereof. The air conditioning system comprises an air conditioning system body, the air conditioning system body comprises a fresh air and return air mixing device and a return air input device, and the return air input device comprises a return air column and a disinfection mechanism used for conducting sterilization and impurity removal on return air input into the return air column; a return air inlet is formed in the outer side wall of one end of the return air column, the other end of the return air column communicates with an air inlet of the disinfection mechanism, a return air shutter is arranged at the return air inlet, and a partition plate is arranged at the end, close to the return air inlet, of the return air column; an air outlet of the disinfection mechanism communicates with a return air inlet of the fresh air and return air mixing device through a pipeline, and the pipelineis provided with an exhau