Abstract: In order to solve the problem that the stem chopping device of the existing ear-stalk and corn harvesting machine is located at the rear of the whole machine, the stem is rolled by the tire during the operation, which causes a high rate of stalk shredding. Stem chopping device under the header. The shredding device carries out the structural design of the "L" type shredder, and the finite element static analysis of the single shredder is carried out to obtain the stress map and deformation distribution map of the shredder. And the amount of deformation are within the allowable range. A field test was carried out on the shredding device. The test result showed that the qualified rate of the stalk shredding length was 90%, and the stalk impurity rate was 0.5%. The results showed that the shredding device met the design requirements.