PROBLEM TO BE SOLVED: To provide an automatic plant grafting device having a simplified structure, and capable of improving accuracy in working and an operating efficiency by equipping the device with a transplanting mechanism, etc., for transplanting a seedling after an graft- treatment into a temporary planting tray. SOLUTION: This automatic plant grafting device is obtained by constituting a first taking out mechanism 21 equipped with a cutting part for cutting the lower parts of a row of seedlings 1 for stocks in stock trays 2, and a nipping and holding part for nipping and holding the upper part of the seedling 1 for the stock, and a second taking out mechanism 22 equipped with a cutting part for cutting the lower parts of a row of seedlings 4 for grafts in graft trays 5, and a nipping and holding part for nipping and holding the upper part of seedlings 4 for the graft, 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 seedling 4 for the graft, of which lower side part is cut off, with the upper end of the seedling 1 for the stock, of which upper side is cut off, 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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