High-standard opening-up serves as a powerful driving force for comprehensively advancing high-quality development. From the three dimensions of rule alignment, independent opening-up, and participation in global economic governance, this paper constructs an index system with both “Chinese practical characteristics” and “common international rules”, and measures the openness level of 50 countries in the world from 2014 to 2023 and makes a comparative analysis. The results show that China’s high-standard openness has significantly improved, ranking from 33rd to 7th. Specifically, China has outstanding advantages in rule alignment in the fields of environmental protection and e-commerce, while the degree of alignment in areas such as property rights protection, industrial subsidies and labor protection needs to be further improved.There remains substantial room for improvement in the openness of service markets and capital markets. China performs well in safeguarding the multilateral trading system, yet greater efforts are needed to accelerate the development of its free trade agreement network.This paper assesses China’s global standing in high-standard opening-up and identifies its strengths and weaknesses, which carries important implications for fostering a new system for a higher-standard open economy.