The extension is worth $1.15 million, according to a source familiar with the negotiations.
"I've been on a few teams the last couple years, and coming in here on a tryout and not knowing what to expect, getting a chance to stay here for another year is exciting," Emery said.
Emery, 29, went 15-9-4 this season with a 2.81 goals-against average and a .900 save percentage. He was 10-0-3 at home, starting in stretches when Corey Crawford was struggling. Emery is glad they both are returning.
"It's good knowing who your partner is going to be and we kind of developed a relationship this year where we work well together," Emery said.
Emery came to the Blackhawks on a tryout in September and signed a one-year deal before the season began.
He was 7-2 with the Anaheim Ducks last season, leading them to the playoffs after recovering from a serious hip injury.
ESPN.com's Pierre LeBrun contributed to this report.