NSW Premier Gladys Berejiklian is on Tuesday expected to announce a multi-million dollar package for a reported 350 student support officers and 100 additional full-time counsellors or qualified psychologists in high schools.

"We know that mums and dads and grandparents are worried about it, but so are teachers. That’s why we have dedicated to making sure two mental health experts will be in every single high school across NSW," the premier told Seven's Sunrise.

The experts will be on hand to offer extra support and advice for students struggling with anxiety, stress and bullying.

They will also determine if students need to be referred to experts outside the school environment.

"We know in this social media age the challenges are huge, whether it’s dealing with bullying, whether it’s dealing with relationships, whether it’s dealing with a whole range of other issues. Often teenagers need that extra support," Berejiklian said.

NSW Education Minister Rob Stokes said the funding will help normalise speaking up and seeking help when it comes to mental health.

“It is critical that parents, teachers and students know there is always someone they can turn to for support,” Stokes said in a statement.

About 14 per cent of children between four and 17 years old experience a mental illness - a figure the government expects to rise.

The announcement comes less than five weeks before the state election on March 23.