An automatic control method for the tobacco leaf deleafing machine set includes such steps as inputting the leaf output rates needed by the first and the second deleafing stages to a master control computer, acquiring the leaf flow data at the outlets of said two deleafing stages and the leaf converging outlet, inputting the leaf flow data to said master control computer, calculating the actual leaf output rates, comparing them with their settings to obtain differences, and outputting the motor rotation speed control signals to control the rotation speed of the relative motor for deleafing roller.