Wangchannoi was born in
Tambon Wang Chan,
Amphoe Khok Samrong,
Lopburi Province in
central Thailand. He received a diploma from Rattana Commercial School (now Rattana Bundit University). He began his career at the age of 10 and quickly built a reputation in his hometown. Later, he moved to Bangkok to fight under the renowned promoter
Songchai Rattanasuban. He gained wider recognition after defeating
Namphon Nongkeepahuyuth to win the
Lumpinee Stadium Junior Flyweight title. This bout was part of the undercard for the
WBC World Super Flyweight title fight between
Gilberto Román and
Kongtoranee Payakaroon. He also won the Lumpinee Stadium
Flyweight title four times. Eventually, he vacated the Flyweight title to move up to a heavier weight class. In the Junior Featherweight division, he won the Lumpinee Stadium title five times. At his peak, his highest fight purse reached 260,000
baht. He faced many top-tier fighters, including
Oley Kiatoneway,
Chamuakpetch Hapalang,
Samransak Muangsurin, Kongtoranee Payakaroon,
Jaroenthong Kiatbanchong,
Karuhat Sor.Supawan, and the legendary
Samart Payakaroon. His match against Samart was particularly memorable, as Samart was widely considered the greatest Muay Thai fighter of the era. Wangchannoi defeated him on the undercard of the
IBF Junior Flyweight World title fight between
Tacy Macalos and
Muangchai Kittikasem, held on May 2, 1989, at Lumpinee Stadium. Following the bout, Samart announced his immediate retirement in the ring. In 1993, Wangchannoi was named Fighter of the Year. In 1993, he was awarded best fighter of the year. He earned the nickname
The 33-Second Puncher from Muay Thai fans after knocking out
Namkabuan Nongkeepahuyuth—Namphon's younger brother—in just 33 seconds of the first round. He also became known as the
Chivas Lad due to his frequent post-fight drinking sessions with friends. ==Retirement==