Alcohol advertising would be banned from buses and other state-owned public transport infrastructure under a proposal from Western Australia's former mental health minister.

Helen Morton said she had been planning to take the proposed ban to Cabinet before she was dumped as a minister earlier this year, and had now asked Transport Minister Bill Marmion to implement the policy.

Mrs Morton said the Government received about $7 million from advertising on buses and other transport infrastructure each year, with alcohol promotions responsible for $160,000.

She said it was a double standard for the Government to spend money trying to reduce problem drinking while at the same time profiting from alcohol promotions regularly seen by children.

"[Alcohol] costs $730 million in taxpayer dollars [in WA] every year, but as a Government we advertise alcohol on our own facilities," she said.

"This is about helping to close off alcohol advertising impacting on children and young people that cannot be switched off. It is there for them 24 hours a day, seven days a week.

"If the Government does not adopt this policy, I hope that all political parties will take this to the election."

'Future government' may review advertising: Chown

The Parliamentary Secretary for Transport Jim Chown said processes were already in place to ensure advertising was responsible, but indicated the proposal could be looked at.

Critics say spending money to reduce problem drinking while allowing advertising is a double standard. ( Flickr: Seb Ruiz )

"I would assume at some stage in the future the [Public Transport Authority] advertising of alcohol will come under review and will be given consideration by a future government," Mr Chown said.

South Australia and the Australian Capital Territory have moved to implement similar policies, along with a range of jurisdictions around the world.

Labor's Upper House leader Sue Ellery said it was appropriate for the Government to consider the idea if it was sending "double messages" by allowing alcohol advertising on its infrastructure.

However, Liberal backbencher Peter Katsambanis said he thought the proposal would only make a "miniscule difference".