Basketball arrived to El Prat de Llobregat in 1932 with the constitution of the Esplai Grupo 49 in the Federation of Young Christians of Catalonia.

The club started playing in the regional leagues until 1962, when the club achieves promotion the Spanish second division for the first time in its history; remaining in the league after their debut season, by winning the relegation playoffs.

In 2003, the club promotes to LEB Plata, third tier, by beating Colmenar Viejo and Granollers in the matches of the Final Eight.

In its first season, the club was relegated to LEB Plata again, but remained in the league after being reinstated due to the existence of vacant places.

In 2016, CB Prat terminated its collaboration agreement with Joventut Badalona.