Is dual citizenship allowed in China?

According to the Nationality Law, anyone who acquires foreign nationality is deemed to have voluntarily renounced China nationality. At present, China does not recognize dual nationality, which is clearly stipulated.

Nowadays, it is illegal for many people to secretly naturalize abroad, but still retain their China nationality. In fact, these people will use China passports when they enter Chinese mainland, Hong Kong and Macao. But once you leave China, you will change to another country's passport. But this is just a loophole. If China and other countries * * * enjoy citizen information, then these people will lose their China citizenship at any time.