Does working overseas count as immigration?

No, if you settle overseas for a long time and obtain permanent residency in a foreign country, your domestic account will be revoked; Without joining external account, domestic accounts will not be cancelled.

China's Nationality Law of the People's Republic of China clearly stipulates that People's Republic of China (PRC) does not recognize the dual nationality of China citizens, and China citizens who have settled abroad voluntarily join or acquire foreign nationality will automatically lose their China nationality. The countries that recognize dual nationality in the world mainly include Canada, the United States (acquiescence), Mexico, Australia, New Zealand, Britain, France and South Korea (conditional recognition).