LNP politicians have been urged to wind back Queensland's abortion laws if they win the next state election.

Both major parties allowed a conscience vote on a bill to decriminalise abortion in October, with three LNP members – Tim Nicholls, Jann Stuckey and Steve Minnikin – voting against the majority of their party colleagues in supporting change.

Protesters hold placards during a pro-life rally in Brisbane in September 2018. Credit:Glenn Hunt/AAP

Last month, an email sent to LNP politicians threatening disendorsement over the abortion vote was found to be a contempt of the Queensland Parliament.

The issue has now resurfaced at the party's state convention during a resolution calling for a future LNP government to legislate "that babies born alive during a late abortion (post-20 weeks) be given the same protection under the law as any other newborn child".