I finished m.sc biotech and want to do PhD in biotechnology at best abroad university and my budget is 15-18 lakh. so please suggest me

At this amount it is very difficult , i can suggest you one thing , you can apply your own base , first you have to make a research proposal and send it to some professors and university in abroad by search on net , if they like proposals then they can also offer you some fellowship , many students

Refer to https://shiksha.com https://studyabroad.shiksha.com/masters-of-science-in-abroad-cl1242 University of Salford Brunel University University of Westminster University of Waikato Chalmers University of Technology