Pneumatic absorption tower, VOC absorption and in-situ desorption system and method

The invention discloses a pneumatic absorption tower and a VOC (volatile organic compound) absorption and in-situ desorption system and method.The pneumatic absorption tower comprises the pneumatic absorption tower, an absorption liquid pump is communicated with an absorption liquid storage tank, and the absorption liquid pump divides absorption liquid stored in the absorption liquid storage tank into two paths to be pumped out; one path of absorption liquid enters two pneumatic absorption towers which are connected in series for two-stage absorption and then returns to an absorption liquid storage tank to form absorption circulation, the other path of absorption liquid enters a flash tower for heating, and the heated absorption liquid is discharged from the flash tower and returns to the absorption liquid storage tank to form desorption circulation; volatile matters generated by heating enter a condenser to be condensed and then are stored in a recycled solvent metering tank; the two pneumatic absorption tow