Abstract: In order to realize topping and restrain-germinating simultaneously and precise profiling of tobacco height, an intelligentized tobacco topping and sucker controlling machine was developed to improve the situation of manual topping and bud inhibition and the technology of tobacco topping that non-discretionary implementation. Fifteen infrared photoelectric sensors in the system were used for profiling of tobacco height. Microcontroller unit was used for controlling rotation direction and rotation angle of stepping motor for lifting or dipping the tool carriage, so the tobacco were topped at the appropriate height. Suckercide spraying system contained an infrared photoelectric sensor that was used for detecting the tobacco. The system sprayed suckercide solution at least 15 mL to tobacco when the sensor detected the tobacco, otherwise, it wouldn’t work. The experimental results indicated that discriminating precision of tobacco height identification system came up to 98%, and suckercide spraying control system could spray more than 15 mL suckercide to each tobacco. The control system can control tobacco topping height accurately and spray suckercide precisely in time.