Can Australia's TAFE diploma be promoted to undergraduate course?

Whether it is recognized by China, you can check whether your diploma is qualified on the website of China Ministry of Education.

As for the undergraduate course, it is only possible in Australia.

Ask some famous schools about the course arrangement of degree transfer. For example, the University of Adelaide has it. I'm not sure whether I can be promoted to junior college, but the arrangement of this course is very similar to that of domestic junior college.

Then it depends on whether you want to develop in China or Australia.

If you are in Australia, your diploma is not very bad. It is easy to find an ideal job by paying attention to practical talents and practicing real skills.

However, if you develop in China, a diploma is naturally important. Then I suggest you go back to China after the college entrance examination. It's safer this way

Wish you success!