Multi-stage selection device for corn seeds

The utility model relates to a multi-stage selection device for corn seeds. The multi-stage selection device comprises a rack; the color sorting assembly is used for distinguishing the seeds into target seeds meeting preset conditions and non-target seeds not meeting the preset conditions according to the colors of the seeds; screen assembly, the screening module is used for screening the target seeds according to the sizes of the target seeds; the screen assembly comprises first screens which are adjacently arranged in sequence from top to bottom; wherein the first screen mesh and the third screen mesh are the same, the second screen mesh is a hollow net-shaped body made of elastic rubber, the hollow part of the second screen mesh can be inflated with gas, and the second screen mesh is the same as the first screen mesh and the third screen mesh in a non-inflated state. The baffle is arranged above the screen assembly and used for preventing the target seeds from falling off from the screen assembly; and the