Currently, the mainly used corn ear variety test are traditional artificial way and semiartificial way based on machine vision. Semiartificial variety test needs people to complete ear of corn placement, then it got the feature extraction of corn ear by using machine vision technology, and the manual collection of corn ear was needed after completing the measurement. The disadvantages of this method were shown as below: semiartificial, nonautomatic, measurement efficiency restricted by manual. To solve these problems and achieve automatic image acquisition and automatic weighing during the process of corn ear variety test traits, an automatic variety test system for corn ear was designed. It included linear vibration feeder, positioned laterally transmission mechanism, pneumatic gripping eight transfer mechanism, image acquisition platform, weighing platform, push mechanism, programmable logic controller (PLC) and computer, which realized the aim of automatic feeding corn ear, automatic sorting, automatic image acquisition and automatic weighing. This project made a prototype trial on the basic. The results of experiment showed that the prototype trial worked well, it gripped and placed corn correctly, and the camera acquired images reliably. One working period costed less than 6s and the measurement speed was up to 600ms per ear using single camera. In general, the prototype meets the requirements of test species.