Can you immigrate back after emigrating?

As long as you don't join a foreign nationality, you still have China nationality only with the legal residence permit (commonly known as green card) of that country. Therefore, there is no such thing as emigrating back. You can buy air tickets at any time and return to China at any time. It's just that you need to pay attention. For example, if you get an American green card, you will live in the United States for half a year. If you go back to China for too long, it will be exaggerated, and it will take more than a few years. Maybe your green card will be revoked. If you plan to live in China for a year or two.