The purpose of this study was to design a four-row vegetable transplanter to solve labor shortage by manual operation for transplanting leafy vegetable seedling in greenhouse. This machine picture was drew by improving the two-row vegetable seedlings transplanter. The machine was driven by three-wheel and could transplant four-row seedlings in one run. The front and rear wheel were made of iron and moved on the bed of cultivated land. The width of four rows were 20, 15 and 20 cm, respectively, and spacing of plants was 20 cm. The width of planting was 70 cm in one run. This machine showed good performance for straight movement and the speed was 8 meters per minute in the field test. The successful rate of transplanting was 100 percent. The work capacity of this transplanter was about 2,400-3,600 plants per hour, about 0.02-0.03 ha per hour and about 4 times faster than that of manual operation.