Network Rail is carrying out the fix to make the lift serving the busy platforms more reliable after recent breakdowns.
The complexity of the important work means the lift will be out of use between Monday 06 and Friday 10 November.
It will affect passengers on intercity services to London, Birmingham, Manchester and Preston, and some trains towards Morecambe, Barrow and Leeds.
For passengers planning to depart from Lancaster, alternative transport to the nearest stations with step-free access – Oxenholme for northbound journeys or Preston for southbound – can be booked in advance.
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People are being advised to allow extra time for their journeys as a result.
Kara Wood, Network Rail's North West head of performance and customer relationship, said: "We know there’s never an ideal time to close a lift and we’re sorry to passengers who’ll be affected by these urgent repairs next week. We’re calling in specialist lift engineers to repair ongoing problems with the lift’s control panel so it’s much more reliable for passengers in future.
"Unfortunately, the complexity of the repair means we've no choice but to take the lift out of service for several days. I'd urge people needing step-free access to platforms 4 and 5 to contact their Passenger Assistance teams as soon as possible to make alternative arrangements during the repair work."
