This is the highest football cup in Spain.

The original system of the King's Cup of Spain was judged by the media as a cup to assist small clubs, because it was eliminated by mixing four Spanish clubs "regardless of grades". The B, C and D clubs that pass the qualifiers have the opportunity to compete with the A clubs, which will stimulate and promote the development of local football and the operation of small clubs. Many third-class teams can earn enough "rations" for one year by virtue of a game against La Liga teams.

However, in the 2005-06 King's Cup competition system reform, low-level teams had to go through several rounds of elimination to meet first-class teams, which reduced the number of matches and the possibility of unexpected matches for La Liga teams, but also greatly reduced the income of many low-level teams. The reformed King's Cup competition system is very complicated: in the first round, the third-level teams and qualified D-level teams were eliminated first, and 18 teams were decided; The second round was held in West B. Last season, the top 20 in West B decided the team of 10. In the third round, the winning 10 team in the second round was mixed with the 18 team in the first round, four relegation teams in West B and two designated teams in West C, and the 17 team was decided. In the fourth and fifth rounds, 17 team plus 1 1 La Liga team that does not need to participate in the European tournament, seven teams were decided after two rounds of elimination. In the sixth round, the seven teams and nine teams in La Liga who participated in the above-mentioned European competitions formed a 16 team, from which two rounds of home and away games were played until the champion was decided.

Previous champions and runners-up of the King's Cup (since King Juan Carlos I ascended the throne):