To reduce the influence of vibration on the performance of the finger clip seed catcher, a corn finger clamp seed feeder with auxiliary clamping structure was designed, and the working principle was described. Besides, the key components of the auxiliary clamp were optimized, and the dynamic model of finger clip seed catcher was established. RecruDyn software was utilized to establish the virtual prototype model of seed discharge device, and corn grain particles were constructed in EDEM software based on the characteristics of corn grains. The process of seed filling, seed carrying and seed discharge in the seed discharge device under vibration conditions was simulated by EDEM-RecurDyn coupling simulation, and the main influencing factors on the performance of finger clip seed dispenser were analyzed. Finally, combined with bench tests, the operation speed, vibration amplitude and vibration frequency of the seed feeder were selected as the test factors, and the qualified index and leakage index served as the test indexes to verify the seed performance. Results showed that the simulation result showed that when the finger clip was opened at 28.65°, the corn grains were gripped, which was consistent with the motion process of the finger clip seed separator under vibration. The results of coupling simulation were basically consistent with the actual motion process of the finger clamp seed feeder. The influence of vibration on the holding performance of the finger clamp can be effectively reduced under the cooperation of the finger clamp and the seed tray, and the design requirements can be met. When the operating speed was 3.8km/h, the vibration amplitude was 5mm, and the vibration frequency was 32.52Hz, the qualified index and missing sowing index of the seed feeder were 91.0% and 6.68%, respectively. It was combined with further tests that the parameter combination metering qualified index was 90.0% and the missing sowing index was 7.1%, which proved the theory of optimal value was close to the actual tests. It was illustrated that the auxiliary clamping structure can maintain good stability in the planting operation, which made the device have a good seeding effect, and met the requirements of precision seeding operation. It provided a reference for the improved design of new corn precision seeding.