The invention discloses a tobacco leaf purchasing system and method. The tobacco leaf purchasing system comprises a selling queuing device, a tobacco leaf hand-in card-swiping device, a tobacco leaf rating device, a weighing device, a tobacco leaf farmer confirming device, a tobacco leaf purchasing server and a selling invoicing device, wherein the selling queuing device, the tobacco leaf hand-in card-swiping device, the tobacco leaf rating device, the weighing device, the tobacco leaf farmer confirming device and the selling invoicing device are respectively connected with the tobacco leaf purchasing server. Queuing device is provided to make on-site order more standard. During a tobacco leaf purchasing process, different devices are used to process tobacco leaves, which greatly reduces unfair trading phenomena. A tobacco leaf farmer confirms after seeing tobacco leaf hand-in data, thereby preventing purchasing disputes. Invoicing accordingly greatly facilitates tobacco leaf farmers, and increases tobacco leaf purchasing efficiency, thereby bringing great convenience.