The robbery happened in Rainham Road at around 9.30pm on Tuesday 15 May 2018 where three men are reported to have entered the shop and threatened a staff member.
One man is alleged to have used a knife to threaten an employee before jumping over the counter and stealing a quantity of cash.
The other men then demanded that the worker opened up a safe where more money was stolen.
These three men then left the store and were seen running away towards the One Stop convenience shop and into a car park behind the store.
The suspects have been described as three white men and two were heard to talk with local accents.
One man was of a slim build with brown hair and the two other men were both described as around 6ft and of a stocky build.
Anyone with information is asked to call Kent Police on 01634 792209 quoting XY/028811/18.
Alternatively to remain anonymous, call Kent Crimestoppers, on 0800 555111.