Polyachikhina was born and raised in Cheboksary, Russia. Cheboksary is the capital city of Chuvashia, Russia. Her parents are Sergey Polyachikhin and Olga Polyachikhina. She currently studies journalism at Chuvash State University located in Cheboksary, Russia.
Polyachikhina began her pageant career with the Miss Chuvashia Pageant. She entered the pageant for the first time in 2015 where she placed as first runner-up. After a strong performance on her first try at the title, Polyachikhina decided to try again. On her second shot at the title, she was crowned Miss Chuvashia 2016.
Polyachikhina’s win as Miss Chuvashia 2016 qualified her to represent Russia and compete in the 2016 The Miss Globe Pageant. She walked away placing in the Top 10.
After a strong start in the pageant world, Polyachikhina decided to enter the 26th annual Miss Russia Pageant. The pageant chooses the country’s representatives for Miss Universe and Miss World. Representing the area of Chuvashia, she competed against 49 other contestants for the chance to once again represent her country on the international pageant stage.
On April 14, 2018, Polyachikhina was crowned Miss Russia 2018 by the outgoing Miss Russia 2017, Polina Popova, at the Barvikha Luxury Village located in Moscow, Russia.
Polyachikhina will go on to compete for the title of Miss Universe 2018 on December 16, 2018 in Bangkok, Thailand.