Unveiling the party's alternative budget on Tuesday, leader Rebecca White said the $40 million program would employ mental health professionals including social workers, youth workers and psychologists at 202 schools.

"We want our children to grow up healthy and strong, mentally and physically," she told parliament, hailing the plan as "landmark".

"Mental health workers will help to destigmatise mental health and foster more supportive peer support networks."

The Liberal government's 2019/20 budget, handed down on Thursday, takes the state into debt for the first time in 15 years partly to fund a $3.6 billion infrastructure spend.

Ms White described the budget as a trainwreck.

"We have seen a tragedy unfolding ... the golden age has been squandered," she said.

Treasurer Peter Gutwein, who last year claimed Tasmania was on the cusp of a golden age, has remained unapologetic about the infrastructure spend and says it will set the state up for the future.

Labor has also pledged to make TAFE free for 5000 students in the building and construction, hospitality, aged care and disability services sectors.

"This means jobs for Tasmanians and a boost for our businesses," Ms White said.

Australian Associated Press