Saline paddy field has the effect on atmospheric carbon sink during the growth period, so the carbon cycle mechanism of the saline paddy soil during the growing season plays an important role in the global carbon emission reduction and global climate change. We select Saline-alkali paddy field in west Jilin as an investigation object to study rice soil invertase activity and soil organic carbon distribution in 0~50 cm soil in different growth stages, and explore the invertase activity and soil organic carbon relationship. We take samples at 0~10, 10~20, 20~30, 30~40, 40~50 cm in not planting rice, seedling, tillering stage, tassel formation and fructicative stages respectively, and determinate the organic carbon content using a total organic carbon analyzer, 3,5-dinitrosalicylic acid colorimetry for the soil invertase activity immediately in the laboratory. The results showed that:the most soil invertase activity is at surface of soil, and invertase activity reduced significantly with increasing soil depth profile in different periods of soil; Soil organic carbon content is significantly reduced with increasing soil depth profile in all periods of soil apart from the heading stage of rice and the fructicative period, the SOC at 10~20 cm is 1.57 g·kg~(-1) and 1.51 g·kg~(-1) respectively, more than 1.30 g·kg~(-1)and 1.31 g·kg~(-1) of 0~10 cm soil layer. Correlation analysis showed that soil invertase activity and soil organic carbon is significantly positively correlated, and the highest correlation coefficient is 0.97 in the seedling stage of rice. Soil invertase activity profile differentiation is closely related to soil organic carbon content, and it has a significant impact on soil organic carbon pool in Western Jilin saline paddy area.