A New South Wales woman who was wrongfully jailed for 10 years has won her High Court bid to seek compensation on the basis of a malicious prosecution.

Roseanne Beckett, from Wollongong, was jailed in 1991 for allegedly trying to solicit others to kill her husband, Barry Catt, as well as attempting to poison him with lithium.

The charges were quashed in a 2005 appeal, but there was never a re-trial because the New South Wales Director of Public Prosecutions decided not to pursue the matter.

Ms Beckett had tried to sue for malicious prosecution but was told she would have to prove her innocence first.

She had asked the High Court to review the law.

Today, the High Court overturned the technicality and outside court Ms Beckett said she was overjoyed.

She said the Crown and the DPP spent millions of dollars trying to stop her from suing.

"It is outrageous to think this is the way they treat Australian citizens," she said.

"They don't care how much money of the public purse they've used doing this and I'm thrilled that these six judges have seen the wickedness and unanimously came back in my favour.

"I'm over the moon, I'm numb and it's 25 years in the making, a very hard slog.

"But thank God I've achieved it what people thought was the unachievable.

"It just speaks volumes to every Australian out there, if you're passionate about something just don't leave it."