Public schools will be offered a $14 billion spending boost over the coming decade as Opposition Leader Bill Shorten escalates the contest over education by pledging to fund thousands of additional teachers under a Labor government.

Mr Shorten will promise more federal funding for every public school across the country as part of an election plan that adds to the $23.5 billion spending increase for all schools legislated by the Coalition last year.

The Opposition Leader will release the policy on Wednesday with a call on the states to sign up to a national plan with strong funding targets, clearing the way for a renegotiation if Labor wins the next election.

Labor leader Bill Shorten and education spokeswoman Tanya Plibersek. Credit:Jason South

The new policy resets the cost of Labor’s intention to outspend the Coalition on public schools, reviving the argument over the Gonski funding reforms of 2012 and the lower funding in the Abbott government budget in 2014.