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Tobacco topping operation was an important link during tobacco planting process. In order to solve the existing problems such as data transmission problem and tobacco topping height recognition problem of intelligent tobacco topping machine, and enhance the practicability and robustness of detection algorithm, a wireless control system for tobacco topping machine was designed. The system could control tobacco topping operation of two rows at the same time, meanwhile complete the integrated operation of tobacco flower identification, tobacco flower location, tobacco topping and sprout inhibitor spraying. The system working principle was as follows: firstly, wireless routing system was used for image acquisition on the machine. Then MSRCR algorithm was used to preprocess the image, so as to eliminate the illumination effect on the tobacco height identification. Then locating the tobacco flower area in the image by a concentric circle camera calibration algorithm and determining the tobacco topping height. Finally, through the control of single-chip microcomputer, stepping motor and pump were used to complete the tobacco topping operation and sprout inhibitor spraying operation, respectively. The test result showed that the tobacco flower recognition rate of the height detection algorithm under the static test can reach 98.5%;camera calibration accuracy reach around 96%, topping accuracy can reach 95%. The tobacco topping machine had a high topping accuracy rate, precise sprout inhibition, and high system stability, which met the agronomic requirement of tobacco topping.