An Irish mum trapped in New Zealand with her children during a bitter custody dispute says her human rights have been violated by the country's court system.

The woman, who can't be named under Family Court rules, has been battling for custody since 2012, and will lodge a complaint with the United Nation's Human Rights Complaint procedure.

"The international human rights of the children and I to a fair trial have been violated by the New Zealand Family Court during the investigatory stage," she said.

"I do not believe the children or I can have a fair trial in the family court in New Zealand."

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She said a psychological report provided to the court contained false information, which has now put her children at risk of being put in court-ordered custody with Child Youth and Family.

"I am currently preparing a complaint ot the United Nations Human Rights Committee in regard to the violations of the children's and mine rights to a fair trial," she said.

The woman, who has not been able to return to Ireland for 10 years, said as a result of the court allowing constant litigation in her case, she has been forced to leave her job to prepare for the appearances.

"I can't leave the children to be chucked into foster care because of arbitrary allegations with no substance and the use of 'junk science'. Somebody has to stand up and say this is not okay."

Earlier this year, an American father-of-two laid a complaint with the UN alleging a New Zealand judge's decision barring him from taking his children out of the country to visit their dying grandfather violated their human rights.

The man laid the complaint under the Human Rights Complaint Procedure after a six-year battle for custody of his children.

The UN complaint alleges that under New Zealand's Care of Children Act 2004 "a child should continue to have a relationship with both of his or her parents, and that a child's relationship with his or her family group, whanau, hapu or iwi should be preserved and strengthened" and that "a child's identity (including, without limitation, his or her culture, language, and religious denomination and practice) should be preserved and strengthened".

The complaint will be presented to a member of the complaints committee who will decide whether there is enough reason for the complaint to be heard.