Police will be granted more lethal force powers during terrorist incidents under new laws set to be introduced into State Parliament.

The Terrorism (Extraordinary Powers) Amendment Bill 2018 will be introduced and read for the first time in the Legislative Assembly on Thursday.

Premier Mark McGowan is urging Upper House MPs not to block the legislation. Credit:Anthony Anderson, 6PR

Police Minister Michelle Roberts said the proposed legislation would give police greater powers in the event of a declared terror incident.

The proposed laws give police clearer legal protection if they're required to use pre-emptive force when responding to a terrorism incident or a suspected terrorist act.