Queensland Premier Annastacia Palaszczuk's new Labor cabinet has come under fire from her own side, with one of the country's most powerful unions saying some ministers are "not up for the job".

CFMEU Queensland branch secretary Michael Ravbar said some of the new ministers had failed in their previous positions but "unbelievably" had been allowed to stay on.

CFMEU state secretary Michael Ravbar has hit out at the Premier's newly appointed Cabinet. Credit:Robert Shakespeare

"The premier must have kept these individuals and their portfolios based on friendship and or loyalty because it would not be based on performance," he said in a statement on Tuesday.

The statement was released just minutes before Labor's new ministry was sworn in at Government House on Tuesday.