About 5,000 teachers will hold stop-work meetings at state schools around Tasmania next week in support of teachers at Elizabeth College.

Thousands of students will start school late or be without classes for half an hour while education union members meet.

The union is angry that the Premier has forced Hobart's Elizabeth College to join his new post-year 10 education system.

Elizabeth College teachers voted against joining the system but David Bartlett has pushed ahead with his plans to implement the Tasmania Tomorrow changes anyway.

The union is concerned the system is not ready and state president, Leanne Wright, has called on 5,000 members to hold stop work meetings next week in support of the college staff.

"Most of those meetings will be at the start of the day so I think parents will be asked to bring their students half an hour later, but where that's not possible, there will be supervision for students at school," she said.

"Members are incensed about what's happened in the case at Elizabeth College.

"The Premier did not keep his word and we need to make sure we have a Minister for Education and a Premier who can be trusted.

"They are also very disappointed about the attitude of 'like it or lump it'. It's not a culture we want in education."

The meetings will affect 210 schools.

Mr Bartlett told state parliament earlier this week that the union is painting too bleak a picture of the Tasmania Tomorrow system.