They say the increase in officers would bring the ACT in line with NSW on a per capita basis.

Opposition police spokeswoman Giulia Jones said police needed to be able to better engage with diverse communities, claiming crime was going unreported.

The Liberals say they will recruit an extra 130 police officers over the next four years and employ another 100 firefighters. They have promised $100 million to deliver the new recruits.

The party also said it would build a new police station in the Molonglo Valley at a cost of $22 million. While Canberra has a lower number of police officers per capita than other jurisdictions, it also has the lowest levels of crime of any capital city.

But Ms Jones said the recruits were desperately needed, with police stretched to the limit. She said ACT had an under-reporting problem, especially among migrant and diverse communities.

"We have a problem with new Australians and new Canberrans who don't necessarily have the same trust in our police forces that people who have lived here for generations have," she said.

"We will address this by better and more in-depth community policing. Turning up to the multicultural festival once a year doesn't mean you know the multicultural community.

"We need to do more to get the ACT police force to do more to get to know the groups that represent them."

Australian Federal Police Association president Alex Caruana welcomed the Liberals' commitment to more officers and a station in Molonglo.

"Canberra is a growing territory and is rapidly expanding, so the commitment to a new police station in the Molonglo Valley is a smart way forward," he said.

Mr Caruana praised the Liberals for delivering three of the five items on the association's election wish list so far.

"The Canberra Liberals' announcement of 130 new police officers, PACER funding and now a new station for the Molonglo Valley clearly shows [they] have done their homework and demonstrates a commitment towards community safety and ACT Policing," he said.

Police Minister Mick Gentleman said the Liberals would not be able to deliver on their promise.

"Canberrans should be asking how are the Liberals going to be funding these promises," he said. "The statistics are there, we are the safest capital city in Australia.

"I can't see how they can possibly fund it, our quick figuring shows it will cost double the amount they've announced today."

Labor has budgeted for 60 new police officers by 2023.