A corn cob-picking mechanism with stalk-choppingfunction was designed. It consists of a cob-picking plate, a pair of stem pull-rollers with rib and a cutting knife roller. Two functions can be achieved by the one mechanism. The corn stalk was chopped by the cutout disk which through the space of pull-roller units when it was being pull down by the two stem pull-rollers. The corn stalks’ characteristics of motion in the mechanism were analyzed by a model of motion process. It was found that the motion trail of the corn stalk in the pull-rollers has quite good straightness. And the test results showed that the seed damage, shattering loss and corn stalk broken were decreased a lot by using this mechanism. The cob-picking were nicely achieved when the stalk were chopped. Remarkable power consumption reduced revealed by the 35% lesser average power consumption compared with traditional way. 