The WA Government has been accused of using taxpayers' money on advertising designed to look like a news story by the State Opposition.

However, Planning Minister John Day has defended the spending saying it complied with strict advertising guidelines.

The Government's Bigger Picture advertising campaign has been running for several years, but in the latest instalment it has paid for an article on a news website.

The article promotes the Government's major projects around Perth, including the Elizabeth Quay project, City Link and the new stadium - but does include the words "sponsored content" at the top.

Labor Leader Mark McGowan said it was a ploy to trick people into believing they were reading a news story instead of a piece of advertising.

He said it was a blatant waste of taxpayers' dollars.

"They are going to spend taxpayers money on a political advertising campaign to try and defend they fact they've spent too much money, isn't that throwing good money after bad?" he said.

"If you read what's actually there it reads like a press release from the Liberal Party and it's being paid for by taxpayers that's how it reads, that's how it's presented and taxpayers are paying for it.

"I don't think taxpayers even know that this money is coming out of their pockets."

Mr McGowan said while he understood the State Government needed some advertising, these paid articles read like a Liberal Party press release.

"I don't object to taxpayers money being spent to save lives on our roads, to prevent fires, to make sure that people are aware they have to be safe in the sun, to advertise for positions in the public sector, a whole range of public benefit advertising campaigns are good and I support them," he said

"But when you use taxpayers money deliberately with malice or forethought to promote the Liberal Party in the way this Government is, it's wrong it's offensive and I think it's a corruption of the use of taxpayers funds."

In a statement, Mr Day said the content was similar to an advertising supplement in a newspaper, but delivered digitally and more cost-effectively.

He said the Bigger Picture campaign educated West Australians about the once-in-a-lifetime transformation of Perth. and cost about $1 million per year.

The statement said a 2014 Auditor General's report found all Government campaigns, including the Bigger Picture, complied with strict advertising guidelines to educate and inform.