Queensland Liberal MP Warren Entsch has dismissed links between a controversial election poster and sexist attacks on former prime minister Julia Gillard as "absolute bullshit".

Mr Entsch's campaign has produced signs criticising Labor's proposed changes to negative gearing with the slogan 'It's a wicked thing to do', complete with an image of a witch and a depiction of Opposition Leader Bill Shorten.

The poster, placed next to signs for Labor's candidate for the seat of Leichhardt, Sharryn Howes, claims the changes would leave 10,000 far north Queensland families worse off and tells voters to "put Labor last".