Abstract: The silage corn feed made by harvesting and fermentation has high nutritional value, which is the material basis for the sustainable development of China’s animal husbandry. Aiming at the problems of poor shredding quality, winding and clogging of straw during the feeding process, and high energy consumption in silage corn harvester, a test bench with feeding and shredding device for silage corn harvester is designed with adjustable feeding height, reversible feeding roll and good shredding quality. The test bench designed can complete the working process of silage corn transportation, feeding, shredding and throwing. Statics and modal analyses are carried out on key parts of the test bench to verify its strength and reliability. Taking shredding length and pass rate of straw as the main performance reference indexes, the performance test of the test bench was carried out. The test results showed that when the feeding speed was 2.5 m/s and the rotation speed of the shredding drum was 1 700 r/min, the average shredding length of straw was 15.6 mm, the pass rate was 96.1%, and the production efficiency was 15 000 kg/h. All indicators are in line with national and industry standards.