Early career Ouyang started to compete for the
Kunlun Fight organization in 2018, winning his first six bouts by knockout. This included a victory over Guan Yirui on November 5, 2018. Ouyang suffered his first professional loss on October 3, 2019, when
Dzianis Zuev defeated him by decision on
Kunlun Fight 86.
Wu Lin Feng On May 15, 2020, Ouyang entered a Super Rookie Cup for Wu Lin Feng in the 70 kg division that would serve as determining a new national champion while international competition wasn't possible due to the COVID-19 pandemic. In his first group stage fight he defeated Song Shaoqiu by unanimous decision at the
Wu Lin Feng 2020: King's Super Cup 1st Group stage event. Ouyang and Song Shaoqiu rematched in the final of the Super Rookie Cup on August 29, 2020, for both the Wu Lin Feng −70 kg national title and the vacant IPCC China title at
Wu Lin Feng 2020: China New Kings Tournament Final. Ouyang won the fight by technical knockout in the second round with low kicks. On November 27, 2021, Ouyang faced
Han Wenbao for the third time at
Wu Lin Feng 2021: World Contender League 7th Stage. He won the fight by unanimous decision with all three judges scoring the fight 29–27. On March 26, 2022, Ouyang saw his 15 fights win streak come to an end when he faced
Luo Chao for the third time in the final of a four-man tournament at
Wu Lin Feng 528. He lost the fight by unanimous decision with all three judges scoring the bout 29–28. On March 18, 2023, Ouyang defeated veteran
Christian Baya by unanimous decision on
Wu Lin Feng 535: China vs Netherlands. On May 6, 2023, Ouyang defeated Arman from Armenia by technical knockout in the first round at the 2023 Huya Kung Fu Carnival. Ouyang faced
Anatoly Moiseev for the
Wu Lin Feng −70 kg title on July 29, 2023, at Wu Lin Feng 540. He won the fight by first-round knockout with low kicks.
K-1 Ouyang was scheduled to challenge
Hiromi Wajima for his
K-1 Super Welterweight title on December 9, 2023, at
K-1 ReBIRTH 2. He won the fight by second-round knockout. Ouyang faced the former
Glory Lightweight champion Davit Kiria at
Wu Lin Feng 2024: 12th Global Kung Fu Festival on January 27, 2024. He won the fight by a second-round technical knockout. On February 8, 2024, it was announced that Feng would be one of sixteen participants of the
K-1 World MAX 2024 - World Tournament Opening Round where he would face Pascal Schroth on March 20, 2024. Feng won the fight by unanimous decision. On October 26, 2024, Ouyang took part in a 4-man tournament at
Wu Lin Feng 549. In the semifinals he defeated Johannes Baas by unanimous decision. In the final he defeated
Aleksei Ulianov by unanimous decision after scoring a knockdown in the second round and qualified for the
Wu Lin Feng World MAX Tournament Final. Ouyang faced
Luo Chao in the semifinals of the 2025 Wu Lin Feng World MAX 70kg Tournament at
Wu Lin Feng 2025 Global Kung Fu Festival on January 25, 2025. He won the fight by unanimous decision and advanced to the tournament finals where he faced
Han Wenbao. Ouyang won the fight and the tournament title by unanimous decision. Ouyang made his first
K-1 Super Welterweight (−70kg) title defense against
Darryl Verdonk at
K-1 Beyond on May 31, 2025. He retained the title by unanimous decision. Ouyang faced
Kacper Muszyński in the 2025 K-1 World MAX Qualifier bout at
K-1 World MAX 2025 - World Tournament Opening Round on September 7, 2025. He won the fight by majority decision. Ouyang faced
Jonas Salsicha in the quarterfinals of the 2025 K-1 World MAX at
K-1 World MAX 2025 - World Championship Tournament Final on November 15, 2025. He lost the fight by unanimous decision, with scores of 27—30, 27—30 and 28—30. ==Titles and accomplishments==