Abstract: Aiming at the problem of high multiple rate,missing rate and low operating speed common to the current potato metering device,a three-claw spoon type potato precision metering device was designed. The main structure and working principle of the seed metering device were described. The key components of the seed metering device were theoretically analyzed and structured. Combined with single factor simulation experiments,the parameter range of main factors affecting the seed metering performance were determined. Carried out the quadratic orthogonal regression rotation combined test with length of three claws,center distance of three claws bottom surface,inclined angle of three claws and rotation speed of driving wheel as experimental factors,and analyzed the experimental data to obtain the regression model and factors on the test index of influence relationship. Multi-objective optimization of the test results showed that length of three claws was 38. 04mm,center distance of three claws bottom surface was 16mm,inclined angle of three claws was 29. 07°,and rotation speed of driving wheel was 53. 05r/min,the qualified rate was 94. 49%,the missing rate was 2. 19%,and the multiple rate was 3. 32%. The bench test of the seed metering device under the optimized parameters showed that the qualified rate,missing rate and multiple rate of the seed metering device were 93. 33%,4. 17%,and 2. 5% respectively,which verified the reliability of the simulation optimization results. The test results showed that the three-claw spoon type potato precision metering device could maintain good seeding performance under high-speed conditions.