Prime Minister Scott Morrison has criticised former opposition leader Bill Shorten's campaign in Western Australia and put the state's militant unionists on notice in his first address to WA Liberal faithful since becoming leader in 2018.

Mr Morrison also praised WA's Liberal Party for what he described as a "perfect performance" in the recent federal election campaign, in which they held every Liberal seat in the state and delivered the highest primary vote in the nation.

Prime Minister Scott Morrison addresses party faithful at the 2019 WA Liberal Party Conference. Credit:Nathan Hondros

"Labor treated the election campaign as some kind of coronation tour," Mr Morrison told several hundred delegates at the WA Liberal State Conference at Crown Towers on Saturday.

"Labor thought all they had to do here in WA was to turn up and take a bow.