The invention discloses a tobacco grade keyboard input method. A keyboard comprises a button matrix, a single chip microcomputer, a display and a communication interface, wherein the button matrix is a matrix with four rows and seven columns, buttons of the button matrix include direct definition buttons and additional definition buttons, the direct definition buttons include following buttons: upper impure, upper slightly green, upper twisted, upper orange, middle lower impure, middle slightly three, middle twisted, middle orange, fully mature, lower slightly two, lower twisted, lower orange, smooth, upper reddish brown, undergrade and bluish yellow, and the additional definition buttons comprise four digital buttons: button 1, button 2, button 3 and button 4. By the tobacco grade keyboard input method, input of tobacco grade information can be completed only by operating the buttons for one time or two times, so that the tobacco grade information can be input into a computer system quickly, effectively and accurately, and economic loss caused by input of noneffective grades or wrong grades is avoided.