The invention discloses an automatic harvester for leaf vegetables. The harvester is characterized by comprising a retractable frame (1), continuous track mobile devices (2) are arranged at the two ends of the lower portion of the retractable frame (1) respectively, a fork frame lifting device (3) and a storage box (4) are arranged on the retractable frame (1) in the movement direction of the continuous track mobile devices (2) in sequence, and the fork frame lifting device (3) is provided with a flexible clamping conveying device (5); a discharge end of the flexible clamping conveying device(5) is provided with a discharge guide rack (6) corresponding to the storage box (4), and a reciprocating-type cutter (7) is arranged on the lower portion of the flexible clamping conveying device (5). The automatic harvester for the leaf vegetables has the advantages that the labor intensity can be lowered, the production cost can be reduced, and the harvesting efficiency can be improved.