The much-needed work will make step-free access more reliable to both station platforms.
Work will start on Tuesday, December 1, and continue through to March 15. Both lifts will be improved at the same time.
During this time period, no step-free access will be available at the Hawthorns station.
Anyone who needs step-free access to trains or trams should book assisted travel with West Midlands Railway .
Where possible passengers are advised to travel to Smethwick Galton Bridge, which will retain full step-free access throughout the work.
Tom Wadsworth, senior asset engineer for buildings at Network Rail, said: “The lifts at The Hawthorns haven’t been replaced since the rail station was opened in 1995, and need to be upgraded to improve reliability for passengers.
“We understand the lift upgrade at The Hawthorns will be disruptive for passengers and we are working closely with station operators to make everyone’s journey as easy as it can be during the work.
“We thank passengers for their patience while we make these vital improvements for rail and tram passengers in the West Midlands.”
Brenda Lawrence, head of stations for West Midlands Railway, said: “Making the railway accessible for all is our priority and these vital lift improvements will make a huge difference to our customers using The Hawthorns.
“I would like to thank passengers for their patience during the work and encourage them to plan ahead to ensure a smooth journey."
For more advice on assisted travel visit wmr.uk/assistance or call West Midlands Railway on 0800 024 8998.