In 1947 she started throwing discus after she had previously been tested in various other disciplines such as hurdles and javelin throwing . In 1949 she came third at the Soviet championships. From then on she was trained by the experienced coach Dmitri Markov, and she won the Soviet championships from 1951 to 1958, interrupted only in 1957. At the Olympic Games in Helsinki in 1952 a team from the Soviet Union took part for the first time. On July 20, Romaschkowa prevailed against 20 athletes from 17 countries with the Olympic record of 51.42 m.
After the games, Nina Romaschkowa improved the world record on August 9, 1952 in Odessa to 53.61 m. Two years later she won the title at the European Championships in Bern with 48.02 m, and in 1956 she won bronze at the Olympic Games in Melbourne with 52.02 m, untrained and with an injury that had not healed. In an interview, she later said that if anabolic steroids had been tested at that time, she would certainly have been disqualified. The following year she was awarded the Order of the Red Labor Banner . In 1960 she won her second Olympic gold medal with 55.10 m at the Games in Rome . Shortly afterwards she ended her career and worked as a trainer for some time.