The invention discloses a one-way pull-type transplanter which comprises a main framework. The main framework comprises a front end support, a connecting frame and a seat support, the front end support is connected with the front end of the connecting frame, the rear end of the connecting frame is connected with the front end of the seat support, a suspension mechanism is arranged on the front end support, a soil breaking ridge leveling mechanism with an adjustable vertical height is arranged below the suspension mechanism, supporting wheel mechanisms are arranged at two ends of the front end support, a first transmission shaft is arranged on the connecting frame, transmission wheels are arranged at two ends of the first transmission shaft, a first sprocket is arranged on the inner side of each transmission wheel, and a second sprocket and a third sprocket are further arranged on the first transmission shaft. Compared with the prior art, the one-way pull-type transplanter has the advantages that the soil breaking ridge leveling mechanism is additionally mounted below the front end support and capable of breaking small clods on ridges and leveling ridge sides, transplanting depth stability is ensured in the transplanting process, and the mechanism can be vertically adjusted according to different ridge heights to adapt to the ridges in different areas.