An ejecting-clamping-pulling combined seedling fetching device for an automatic transplanter and an operating method therefor. The device comprises: a seedling ejecting mechanism (1), a seedling feeder mechanism (2), a seedling fetching mechanism (3), and a control system. The seedling feeder mechanism (2) is mounted on a stander； the seedling ejecting mechanism (1) is mounted on the seedling feeder mechanism (2) and is located at the rear side of the seedling feeder mechanism (2)； the seeding fetching mechanism (3) is mounted at the stander and is located at the front side of the seedling feeder mechanism (2). An upper ejector rod support (1-6) and a lower ejector rod support (1-4) are provided on the seedling ejecting mechanism (1)； the seedling ejecting rods on the two supports are disposed in a staggered manner, and the upper ejector rod support (1-6) and the lower ejector rod support (1-4) are configured to alternately eject and loosen seedling trays. The ejecting-clamping-pulling combined seedling fetching device can eject and loose seedling trays, and the completeness of the trays is guaranteed. The ejecting-clamping-pulling seedling fetching method can accurately control seedling fetching and feeding actions； and furthermore, the device is simple in structure, high in reliability and efficiency and low in damage rate of tray bodies.
