Plasma seed processing technology was carried on green onion seeds for less than 20 s. The effect of the proposed technology on seed germination and seedling growth was analyzed. Different low-temperature plasma technologies were used on green onion seeds. The results showed that both germination potential and germination rate had obvious change after different low-temperature plasma process. The germination experiment was carried out after 20 d since low-temperature plasma process completing. When the treatment intensity was 240 W, the germination potential and germination rate increased by 10.6% and 5.2%, respectively, compared with the contrast. The germination experiment was also carried out after 4 d since low-temperature plasma process completing. The germination potential and germination rate also changed obviously.