TEACHERS at Peel High School walked off the job on Thursday morning due to the impacts of the school's severe staff shortage.

Staff had to cancel classes for year 11 and 12 students and collapse others this week, and were only able to provide minimal supervision for students on the oval.

NSW Teachers Federation deputy president Henry Rajendra said the school had been unable to cover 22 classes with casual teachers in the past week, too.

"The staffing crisis prompted a walkout by teachers who are fed up with the lack of action by the state government to solve this problem," Mr Rajendra.

"Teachers are alarmed that through no fault of the school, students have been denied a safe and productive learning environment where they can be known, valued and cared for."

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Mr Rajendra said the Gallop Inquiry into the work of teachers found earlier this year that uncompetitive salaries for teachers and unsustainable workloads were leading to teacher shortages.

"The workloads of teachers have increased every year, but their salaries have fallen every year compared to other professions," he said.

"You can't fix the shortages without fixing the wages and workload problem.

"If we don't pay teachers what they are worth, we won't get the teachers we need."

There was also a teachers' strike at Armidale Secondary College on the same morning. They gathered over issues regarding the amalgamation of two former high schools in Armidale.

The NSW Department of Education has been contacted for comment.

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