The invention discloses a farm vehicle decontamination and drying control device and a using method thereof. The farm vehicle decontamination and drying control device comprises a decontamination workshop, a drying workshop, a controller, water storage tanks, a lead screw, a vibration disc, first cleaning rollers, second cleaning rollers and a rotating disc, wherein the drying workshop is arranged on one side of the decontamination workshop, and the water storage tanks are arranged on the two sides of the decontamination workshop; and connecting guide rails are fixedly connected to the two sides of the interior of the decontamination workshop. Through the arranged first cleaning rollers, the multiple first cleaning rollers can be driven by a driving motor to rotate, through friction between the first cleaning rollers and the two sides of a vehicle, residual impurities on the two sides of the vehicle can be scraped off, and through the arranged second cleaning rollers, the connecting shaft can be driven to rotate through the driving motor, the multiple second cleaning rollers can be made to rotate, impurities on the two sides of the lower end of the vehicle can be removed through friction between the second cleaning rollers and the two sides of the lower end of the vehicle, and in the way, the decontamination effect on the vehicle in the washing process of the vehicle can be improved.