According to the results of two rentals, the 13-year-old Russian woman scored 227.30 points - 74.93 for the short and 152.38 for the free program.
The second place with a score of 207.74 (68.45 + 139.29) points was taken by another representative of Russia - Daria Usacheva.
The top three winners closed American Alice Liu - 204.83 (67.52 + 137.31) points.
Russian Maya Khromykh took fourth place, gaining 198.24 (66.78 + 131.46) points.
Earlier it was reported that Shanaeva and Narizhny won the bronze of the Junior World Figure Skating Championships.