Jillaroos captain Isabelle Kelly kept New Zealand Golden Boot winner Stacey Waaka, who had scored nine tournament tries, in check.
Australia beat New Zealand 34-10 in the women's rugby league World Cup final at Suncorp Stadium on Sunday.
The Jillaroos scored six first-half tries, with Jaime Chapman claiming a hat-trick.
Her 13 World Cup tries equalled Honey Hireme-Smiler's 2017 record across men's and women's tournaments.
Australia's fourth straight title followed New Zealand's first three tournament wins, from 2000 to 2008.
Jess Skinner's controversial selection of Jesse Southwell over Jocelyn Kelleher paid off; Southwell kicked five goals and complemented half Tarryn Aiken.
Chapman told Channel Seven, "There is no better win than winning the World Cup on home turf."
She added, "We connected the first day we came into camp."
Millie Elliott retired with the title.
Dual international Sariah Paki added the World Cup to her 2022 triumph with Australia's rugby sevens side.