"This will help remove the secrecy that that has meant some women continue to be underpaid for the valuable work that they do."
The policy was already used in Norway, Sweden and Finland, where income equality is among the best in the world.
The Greens would make public sector bosses responsible for achieving pay equity within government departments, with a target of equal pay by 2025 written into their contracts.
The party also wants to amend pay equity laws to match the recommendations of the Joint Working Group on Pay Equity Principles.
The working group provided principles for employers and employees in resolving pay equity claims and a process for them to follow.
But the Greens say a National Party bill based on the working group's recommendations had actually created more hurdles to women being paid fairly.
The Greens will reverse the onus onto employers to prove that they paying women a fair wage, rather than placing that onus on the worker.
The Greens policy also includes a new expert body to help equal pay claims progress quickly, more funding for the Ministry for Women, and a guarantee that the Minister for Women gets a seat at the Cabinet table by right, not just because they hold other senior portfolios.
Deputy Prime Minister Paula Bennett currently holds the women's affairs portfolio.