This paper studies national income catch-up and crossing the middle-income trap from the perspective of service industry opening-up. The results show as follows. Firstly, it may not promote the catch-up of national income under the high openness of service industry. Secondly, the increasing proportion of service trade in total trade in emerging market countries has a significant role in promoting the national income catch-up index. Thirdly, increasing the proportion of imports and exports of high-tech services in emerging market countries will help to promote the national income catch-up index. Lastly, the proportion of service trade in GDP promotes the catch-up of national income by improving total factor productivity(TFP). Therefore, as an emerging market country, China should emphasize the positive role of expanding the opening-up of service industry in catching up the national income and crossing the middle-income trap. What’s more, China should pay more attention to optimizing the opening structure of service industry, improving the opening quality of service industry, improving the import and export proportion of high-tech services in service trade, and giving full play to the role of TFP in promoting national income catch-up.