The Queensland government will have a "close look" at a scathing report that found the state-controlled road network was deteriorating and being underfunded.

The Queensland Audit Office delivered a scathing assessment in its Integrated Transport Planning document on Tuesday.

It found the Department of Transport and Main Roads had a $4 billion backlog for renewal and maintenance work on existing roads as of June 30.

But that figure will blow out to $9 billion unless funding issues are addressed.

The QAO also found the existing underfunding meant the condition of the state’s roads fell “well short” of the department’s own target standards.

“Without alternative strategies to address the funding issues, DTMR faces a risk that it will not be able to maintain or improve service standards on the transport network to meet Queensland’s future needs,” the report read.

A spokesman for Transport and Main Roads Minister Mark Bailey said it would have a “close look” at the QAO report.

“The Palaszczuk government is delivering record road and transport infrastructure spend for the second year in a row – $21 billion over four years,” he said.

But Opposition Leader Deb Frecklington said the report showed Premier Annastacia Palaszczuk had no plan to build the roads the state needed because it couldn’t even keep up with fixing existing ones.

By Shae McDonald