In the process of laying drip irrigation belt, it is prone to appear relaxation and congestion of the belt when the seeder stops in an emergency, and the laying device has poor adaptability to field surface. In order to solve the problems, a shallow buried laying device for drip irrigation belt with automatic locking function was designed, which was suitable for corn seeder. The device can lock the drip irrigation belt coil in time when the seeder was shut down in an emergency, and prevent the phenomenon of drip irrigation belt winding and accumulation effectively. And it can realize shallow buried laying by copying and ensure the depth consistency of drip irrigation belt. The shaft did not appear resonance phenomenon under the normal operation condition through the modal analysis of the reel shaft of drip irrigation belt. The theoretical analysis and calculation of hydraulic brake device was carried out, and the key factors affecting the overflow amount of drip irrigation belt were determined. The working parameters of the parallel four-bar mechanism and the spring were designed, and the terrain adaptability can be improved through the joint operation with the copying wheel. The designed leveling shovel can compress and reshape the shape of the ditch bottom opened by the double disc ditch opener, providing a superior ditch bottom environment for shallow buried drip irrigation. Field experiments showed that when the forward speed of seeder was 4~6km/h, the qualified rate of the depth laid by the shallow-buried laying device was 93.0%, the variation coefficient of laying depth was 22.3%, and the amount of covering soil was 619.5g. In the process of operation, drip irrigation belt transportation was smooth. When the tractor stopped in an emergency, the automatic locking device of drip irrigation belt transportation can be braked in time to eliminate the accumulation and winding phenomenon of drip irrigation belt.