The club have already seen Owen Farrell, Mouritz Botha, Ben Spencer, Ernst Joubert, Sam Stanley and Duncan Taylor sign contract extensions.
And Brits, who has scored 19 tries in 78 appearances since joining from the Stormers in 2009, had no hesitation in following suit.
Brits said: "There really is something very special happening at Saracens, and I have never been happier in my entire career."
Director of rugby Mark McCall added: "Schalk has been rightly recognised as one of the stars of the Premiership, and I don't believe there is a club in Europe that would not like to have such a gifted and committed player in their squad. We are obviously delighted he has committed his future to Saracens."
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