Cai Liwen is a Chinese Paralympic backstroke, freestyle and medley swimmer. She represented China at the 2016 Summer Paralympics held in Rio de Janeiro, Brazil and she won the silver medal in the women's 100 metre backstroke S11 event. She competed at the 2017 World Para Swimming Championships held in Mexico City, Mexico and at the 2019 World Para Swimming Championships held in London, United Kingdom. At the 2020 Summer Paralympics she won the gold medal in the 100m Backstroke S11 with a world record of 1:13.46, one silver medal and one bronze medal.