The 19-year-old crushed Sofia Kenin 6-4 6-1 to crown an extraordinary fortnight.
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The Moscow-born Florida-based 21-year-old gave a masterclass of game management on a windy Court Phillipe Chatrier and will face Polish teenager Iga Swiatek on Saturday
American teenage sensation Coco Gauff made her top 50 debut in the updated WTA rankings released on Monday, becoming the first 15-year-old in 15 years to achieve the feat.
America’s Sofia Kenin stunned two-time Major champion Garbine Muguruza to win the Australian Open on Saturday, completing a surprise run where she came from nowhere to earn her first Grand Slam title.
Barty was looking to become the first Australian woman to make the final in Melbourne since Wendy Turnbull in 1980 and, as the top seed and world No 1, expectations were sky high.
The unseeded Spaniard arrived at Melbourne Park with low expectations but will now face American 14th seed Sofia Kenin bidding to win her third major title after emerging from a period in the Grand Slam wilderness.