Aquatic weed management is an important part of crab aquaculture. In order to reduce the labor intensity of aquatic weed collection equipment control and decrease the use of personnel, the fan driving system of the aquatic plants comb-collect boat has been developed. The driving system is mainly composed of fan blades, protective devices, brackets, motors, reduction drives and waterproof sealing covers. Through CFD fluid simulation to calculate and verify the resistance of the practical boat, the fan was selected, the rated power is 1 100 W, the working voltage was 48 V, the maximum width of the blade was 100 mm, the inclination angle of the blade root was 28°,and the steering system with self-locking function was designed. The tests of using the drive system in the crab breeding pond showed that the continuous working time was 1.5 hours under the 48 V/24 Ah power battery, and the unloaded and fully loaded boat speeds were 1.14 and 0.43 m/s respectively in the absence of anhydrous weeds. The maximum speed of unloaded and fully loaded boats was 1.06 and 0.26 m/s respectively under the condition of mild aquatic weeds （the top of aquatic plants was >3 cm and <8 cm from the water surface）. The maximum boat speeds of unloaded and fully loaded boats under severe aquatic plants （the top of aquatic plants was ≤3 cm from the water surface） were 0.71 and 0.12 m/s, respectively, and they could maintain a forward posture and continue to collect aquatic plants. The average turning radius was 1.2 meters. The on-site application showed that the driving system meets the dynamical requirements of the combing boat in the actual aquatic weed environment of the crab pond, and the weight of the aquatic weed increased by 94.3% per unit time compared with the manual cleaning of the aquatic weed, laying the foundation for the realization of automatic aquatic weed management.