The Segona Divisió 2017/18 was the 19th season of the second highest football league in Andorra . It started on September 24, 2017 and ended on May 13, 2018.
Each team initially played against each other twice; once at home and once away. After 18 matchdays, the top five teams qualified for the promotion round, in which reserve teams are not allowed. The first rose directly, the second-placed played against the seventh of the Primera Divisió in the relegation.
The teams in places 1 to 4 and 7 took part in the promotion round, in which each team played four games in a simple round. The results from the preliminary round have been adopted.