At the 2017 World Championships Black qualified to the all-around final in third place, the vault final in seventh, and the balance beam final in fourth. She was originally a reserve for the floor exercise final but was put in as a replacement for the injured American Ragan Smith. Black made history in the all-around final by becoming the first Canadian to win an all-around medal at a World Championships, winning the silver medal behind American Morgan Hurd. During the all-around final Black recorded the third highest score on vault, fifth highest score on uneven bars, third highest score on balance beam, and eighth highest score on floor exercise. She was the first Canadian in 11 years and only the second Canadian ever to win a medal in any event at the World Championships. During event finals Black placed fourth on vault (where she recorded the overall highest execution score), eighth on balance beam after a fall, and seventh on floor exercise after an out-of-bounds deduction.