NSW Education Minister Adrian Piccoli has declared a "war over fairness" and accused the federal government of abandoning public schools as negotiations between ministers over the future of education funding look set to break down before they have even begun.

A new analysis by the NSW Department of Education, released the day before meetings were set to kick off, claims NSW schools will face a funding cut of $400 million from 2018 under the federal government's plans.

According to the analysis, public schools are expected to shoulder the cost of $100 million being re-distributed to other states while private schools are spared.

"I've seen those schools, Canley Vale Public, Curran Public, I've seen what impact that extra money is having," Mr Piccoli told Fairfax Media.