The Ghanaian native beat Olympians Lana Gehring, Jessica Kooreman and Katherine Reutter-Adamek  in the first 500 final at the short track trials.
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"I can't believe it, aww geez. It's a really good feeling, but it has to set in first because it takes me a while. I'm like, 'Holy cow,'" she said after the victory.
Biney took an early lead in the final that widened as the race went on.
She recounted her excitement, "When I realized that I made the Olympic team, I started cheering like crazy and then I made my epic fall."
Biney will be the second black speedskater on a U.S. Olympic team after Shani Davis qualified for the short track team in 2002 at the age of 19.
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