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Aiming at the problem that the seed quantity of the high speed precision seed discharging device can not maintain the best working state due to the fluctuation of the seed quantity in the device, a technical idea was put forward to improve the structure of seed feeding device and optimize seed feeding control model. An intelligent seed supply system was designed, which adopted a seed supply wheel structure with replaceable wheels and a wave variable supply mode based on sine function. The fluctuation amplitude of seed supply speed was adjusted in real time according to the seed supply effect, so as to keep the seed quantity in the seed discharge device in a good range and ensure the continuous work of the seed discharge device under high operating performance. The structural parameters of the key components were designed, and the advantageous operating intervals of thetype seed feeding wheel with different structures were obtained and verified by discrete element simulation and bench test. The experimental results showed that the type of seed feeding wheel could maintain the variation coefficient of seed feeding speed below 20% in the range of 250~1500g/min by changing its own structure. After optimization, the type of fluctuation variable seed supply control model would make the seed supply rate change smoothly in the way of fluctuation variable seed supply, and carry out the fluctuation seed supply in the range of 500g/min to 1500g/min around the supply demand. The research result can meet the technical requirements of corn precision sowing.