PROBLEM TO BE SOLVED: To provide an automatic plant grafting device, capable of aiming at the reduction in an overall treating time and improving a taking ratio and a working efficiency by equipping the device with a transplanting mechanism, etc., for transplanting a seedling after a graft- treatment into a temporarily planting tray. SOLUTION: This automatic plant grafting device is equipped with a controlling means for activating a first and a second taking out mechanisms 21, 22 so as to cut the lower part of a seedling 1 for stock and the lower part of a seedling 4 for a graft after performing a nipping and holding treatment of the upper part of the seedling 1 for the stock and the upper part of seedling 4 for the graft by a nipping and holding part, and take out the seedling 1 for the stock and the seedling 4 for the graft from a stock tray 2 and a graft tray 5, and is also equipped with a first cutting mechanism 16 for cutting the upper side part of the seedling 1 for the stock taken out by the first taking out mechanism 21, a second cutting mechanism 17 for cutting the lower side part of the seedling 4 for the graft taken out by the second taking out mechanism 22, grafting mechanisms 19, 20 for performing a graft- treatment by joining the lower end of the cut seedling 4 for the graft with the upper end of the cut seedling 1 for the stock in a prescribed posture, and transplanting mechanisms 19, 20 for transplanting the seedlings after the graft-treatment into temporarily planting trays 8.
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