The university won three Green Gown Awards – for enterprise, courses and learning, and food and drink.
The event, held at Whitworth Hall, University of Manchester, and introduced by author and television presenter Simon Reeve, saw Plymouth take one fifth of all the awards on the night.
Professor David Coslett, deputy vice-chancellor, said: ‘This trio of awards cements Plymouth’s reputation as the leading green university in the country, and demonstrates how that expertise permeates across the institution.
‘Our commitment to sustainability runs through our teaching, our research, and the way we run our campus – and we do it because it is the right thing for our students and our community.’
In the Enterprise category, the University won for its Peninsula Dental Social Enterprise (PDSE), which provides dental outreach services and treatment to a wide range of community groups.
Staff and students run brushing clubs at local schools, work with some of the most vulnerable members of the community such as the homeless and drug addicts, and have been developing learning resources and tools so that these practices can be adopted by other organisations and universities.
The PDSE also oversees all of the NHS treatment that students, under supervision, provide to the 16,000 registered patients at its four dental facilities in Plymouth, Truro and Exeter, and it also orchestrates student volunteering in the community.
The awards are the latest in a line of accolades for Plymouth.
It won a Green Gown for Continuous Improvement – Institutional Change in 2011, and has been the overall best performing university in the People and Planet Green League since it began.
It is also ranked in the top 10 universities in the global UI Greenmetrics league.