A comparative experiment was carried out on pot-seedling and carpet-seedling mechanically transplanted under different sowing dates and transplanting dates of continuous cropping late rice in order to improve the production efficiency and yield of continuous cropping late rice. The results showed that, the quality of pot-seedling was better than that of carpet-seedlings under the same sowing conditions. Under the same sowing and planting period, compared with the carpet-seedling mechanically transplanted, the duration from sowing to heading of pot-seedling mechanically transplanted was shorter, the full heading period was advanced, but the whole growth period was basically the same. The yield of pot-seedling mechanically transplanted was significantly higher than that of carpet-seedling mechanically transplanted, with an average increase of about 150 kg/667 m². In the same way of seedling raising and transplanting, with the postponement of sowing dates and transplanting dates, the seed setting rate decreased, and the yield increased first and then decreased. The B2 treatment (seeding on July 2 and transplanting on July 30) had the highest yield, and the pot-seedlings mechanically transplanted could be planted later than the carpet-seedlings mechanically transplanted. According to the local production practice of Wenling County, the transplanting of continuous cropping late rice should be completed before the beginning of autumn in order to achieve high yield.