The invention relates to the technical field of tobacco leaf purchase. A tobacco purchase precision management and control system comprises an automatic grading system, an automatic purchasing system,a secondary acceptance evaluation system and a control center. The automatic grading system comprises a grading device, a cigarette basket and a conveyor belt. An electronic display screen is arranged on the cigarette basket, and an RFID chip is installed at the bottom of the cigarette basket. The front end of the conveyor belt is provided with a first UHF reader/writer. The grading device is provided with a wireless signal transmitter communicatively connected with the electronic display screen of the cigarette basket; The secondary acceptance evaluation system comprises an electronic scaleand a second UHF reader/writer is arranged on the electronic scale; the automatic acquisition system comprises a mobile collection hopper and a central warehouse; the control center is communicativelyconnected with each device, and the invention also designs a tobacco purchase precision management and control method. As the grading purity of the tobacco leaves of the tobacco farmer is improved, the purchase grade proportion of the tobacco leaves is improved, the company cost is reduced, and the satisfaction degree of the tobacco farmer is improved.