Western Australia has a new Minister for Aboriginal Affairs, with Don Punch taking the role in the Cook government's cabinet reshuffle.

The Labor government won a landslide victory in the March 8 election.

During the campaign WA Liberal leader Libby Mettam parroted her federal counterpart Peter Dutton's vow to remove the Aboriginal flag from official press conferences, drawing widespread criticism.

The culture war tactic fell flat, with the Liberals on track to win six seats, Labor secure in 44, the Nationals on four seats, and five still undecided.

Mr Punch, the Member for the south-west seat of Bunbury since 2017, has qualifications in psychology and social work and worked as a social worker across regional WA and later as an executive in the public sector.

Among the key issues Mr Punch will face as Minister are regional employment, justice - particularly youth justice, water and other vital infrastructure in Indigenous and predominantly Indigenous communities, and heritage protection.

The new Aboriginal Affairs Minister previously served as Minister for Regional Development; Disability Services; Fisheries; Seniors and Ageing; Volunteering. In the new Cook government, he holds the portfolios for Climate Resilience and Water as well as Aboriginal Affairs.

Member for Kimberley Divina D'Anna, a Yawuru, Nimanburr, and Bardi woman raised in Broome, will hold the role of Parliamentary Secretary to the Premier in the new Cabinet.

Ms D'Anna was returned to office with a projected 61.6 per cent of the two-party preferred vote. She is the first Aboriginal woman to hold a Parliamentary Secretary position in WA, in a role that will involve providing support and advice directly to the Premier.

Paul Papalia has retained the justice portfolio, but the police portfolio has been shifted from Mr Papalia to Reece Whitby.

Stephen Dawson has Regional Development among his portfolios, and John Carey retains Housing and Works. Jessica Stojkovski will serve as Minister for Child Protection, and Sabine Winton holds Education, Early Childhood and Preventative Health.

Premier Roger Cook has also introduced a number of regional-focused portfolios, with a dedicated Minister for each region. Mr Dawson is taking responsibility for the Kimberley and Amber-Jade Sanderson the Pilbara.

Mr Punch's predecessor as Aboriginal Affairs minister, Dr Tony Buti, has become the state's Attorney General and also has responsibility for Commerce alongside tertiary and international education.