Teachers have warned that the NSW government freeze on TAFE fees will not be enough to curb plummeting enrolments in the state's public vocational education provider.

Fees have been frozen at their 2015 levels in a bid to lure back students to the struggling institution.

Since 2012, 83,000 fewer students have enrolled in TAFE NSW campuses, while fees in some courses have surged as much as seven times 2013 levels.

The move comes just three months after NSW Skills Minister John Barilaro refused to acknowledge the effect of fee hikes on enrolments at a NSW parliamentary inquiry into vocational education.