The 29-year-old has long been strongly linked with a move to Premier League rivals Manchester United.
United had two bids for Baines rejected in the summer and it is reported that they will make a new bid in January.
But Martinez insists that Baines will stay at Goodison.
“I can guarantee he will be here at the end of the season. That is 100 percent,” said Martinez.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.