Figures show PhD students are most likely to feel unwelcome (65.8%) with those from Japan (64.5%), Nigeria (62.8%) and India (62%) the next most likely to say they have received hostile treatment.
Students from India, Pakistan and Nigeria are most likely to advise their friends not to study here.
Asked what most perturbed them, 40% cited moves to get landlords to check on their legal status, while 74% said introducing an National Health Service (NHS) levy would make it either impossible or more difficult to study in the UK.
Student leaders argue the figures are extremely worrying, as international students are estimated to contribute over 7.9 billion pounds a year to the UK economy.
Figures show a drop in recruits last year - from 2,39,000 to 1,97,000 - although the latest, The Universities and Colleges Admission Service (UCAS) statistics indicate they are rising again this year.