"I am humbled and happy to be here," said Sturridge.
"Brendan Rodgers said he sees me here for a long time - and I also see myself here for a long time. I've not signed here to play for a couple of years and then move on.
"I've signed to be here for as long as possible. It's a humongous club - for me, one of the biggest in the world - and to have the fans and world-class players we have here is amazing."
Sturridge will wear the number 15 shirt at Liverpool, the club have confirmed.