Leader Tim Hudak says the college is nothing more than a money grab and is standing in the way of creating jobs for young people.
Some in the industry says the college opens the door to a new government business tax.
Supporters say it has helped create a level playing field for shops and technicians through better enforcement.
Premier Kathleen Wynne also defends the year old College.
The Premier says the college is designed to make sure people in the skilled trades are qualified to do the job.
