Both doctoral thesis and master thesis need innovation. If you are not clear, you can go back to the graduate handbook and other documents and study the relevant chapters of your graduation thesis carefully.
brief introduction
Doctoral thesis requires extensive knowledge and in-depth understanding of related fields, and innovation on the basis of all existing research, and this originality requirement should be recognized by peers. Specifically, among the hard indicators, several sci articles must be published after doctoral graduation.
However, the requirements for master's thesis and originality are not so high, especially for many masters. It can be said that as long as there is a slight change, no one will really do it, and it will not completely repeat the work of others, so it can also be recognized. Specialization requires engineering application, not academic originality.
What is the concrete manifestation of this difference? If you change a material, use the same method and have similar results, your essay will probably be published in the journal of water. However, if you go to the water thesis like this and translate it into a doctoral thesis, there is still a high probability that you will be strongly criticized for lack of originality in the process of blind evaluation.