As of 2021, it is difficult to give an exact number of foundries in China, as the number is constantly changing due to various factors such as industry consolidation, closures, and new startups. However, it is known that China casting foundry has a large and thriving foundry industry, and is considered to be one of the leading countries in the world in terms of foundry production.

According to data from the China Foundry Association (CFA), there were over 7,000 foundries in China in 2019. This number has likely fluctuated in the two years since, but it is still a significant number compared to other countries.

The CFA represents a wide range of foundries in China, from small family-owned businesses to large corporations, and covers a variety of casting processes such as sand casting, investment casting, and die casting.

The foundry industry in China has experienced significant growth over the past few decades, fueled by the country's rapid industrialization and urbanization.

The industry has also benefited from China's abundant natural resources, such as coal and iron ore, which are used in the production of castings.

Additionally, China has a large and skilled workforce, which has helped to drive down labor costs and increase production efficiency.

However, the foundry industry in China also faces several challenges, including increasing environmental regulations, rising labor costs, and intense competition.

Many foundries are also working to transition to more advanced manufacturing techniques, such as automation and digitalization, in order to remain competitive in a global market.

Overall, while the exact number of foundries in China may be difficult to pin down, it is clear that the country has a significant and growing foundry industry.

As China continues to invest in infrastructure and modernization, it is likely that the foundry industry will continue to play an important role in the country's economy.