The existing station has reached the end of its economic life and will be replaced by one on the same site.
If Cornwall Council approves the plan the existing station will be demolished later this year and officers will be temporarily relocated on the Heathlands Business Park.
The new station is expected to open in November 2019.
Chief Superintendent Jim Pearce, Cornwall’s police commander, said: “'This investment in Cornwall is hugely positive for our staff, our continued ability to work closely with our partners and for members of the public that we serve.
“My team and I are committed to assisting the project in any way we can to ensure the new facilities meet our operational requirements, both now and in the future.''
The decision to rebuild on the existing site was made due to existing co-location with Cornwall Fire, Rescue and Community Safety Service and South West Ambulance Foundation Trust.
All three services are committed to maximising opportunities the new facility will bring and continue to work closely together to improve services in Liskeard.
This includes working together to develop a design that will allow for potential future expansion.
Liskeard police station as it is today.