Abstract: In order to solve problem of seedling low quality affected by climate and environment for traditional rice seedling，with the aim of controlling internal environment of seedling raising system，a new climate box for rice seedling raising was designed.Light intensity and time of artificial light was adjusted，temperature，humidity and CO2 concentration were controlled by PID fuzzy control，nutrient supply cycle and supply quantity were adjusted，and interior mounted visual surveillance system.The illumination range of climate box was 0～1.2×104 Lx，temperature range was 0～50 ℃，the deviation was±0.5 ℃，humidity range was 50%～99% RH，deviation was±5% RH，CO2 concentration range was 0.028%～0.2%，deviation was±0.008%.Test results showed that seedlings of climate box cultivation had developed roots，green color and wide stem，it could reach 3 leaf stage after planting for 20 days，the plant height could reach standard of transplanting seedlings.