The seed placed funnel, driving gear and rotational hopper are self-restraint. Among the bottom of seed placed funnel had a limited notch can only allow garlic seed scaly to extend. The correcting mechanism included rotational hopper, rotational cylinder and telescopic cylinder. The automatic control system included infrared sensor, MCU, pneumatic solenoid valve, opening and closing control cylinder and air compressor. The part of scaly bud which extended from limited notch of seed placed funnel could be detected by infrared sensor, and the rotational hopper was driven horizontally by telescopic cylinder and rotated 180° by rotational cylinder.