Can mainland students become legal residents of Macao after staying in Macao for 7 years?

Of course not

Mainland students going to Macau are purely studying abroad

During the period of studying abroad, they use student endorsements and cannot get Macau ID cards.

The law also stipulates that you cannot engage in any paid work, that is, not part-time, let alone full-time.

After graduation, you will return to the mainland. If you want to work in Macau, you must handle it in the same way as foreign workers.

If you are a professional talent that is in short supply in Macau, you can work in Macau through skilled immigration, and you can become a Macau resident, but it is not easy to get approval~