Lionel Messi's extra-time strike earned Barca a 2-1 win over Estudiantes in Abu Dhabi and means Guardiola's troops now hold all six titles they have competed for this year.
It has been remarkable period for Barca and not least for Guardiola, who only took the reins 18 months ago, but rather than take the credit for himself, the coach preferred to hail the contributions made by his team.
"For me this was a great year. We have achieved something that no-one has achieved before," said Guardiola, who was in tears following the final whistle.
"I'm lucky that I have such quality players in my squad. The success that we've had has been down to them and I'd like to thank them for that.
"To win six successive titles is unthinkable. So many things contributed to it; having few injuries, a squad made up of players who play because they like to, mental strength...
"Everyone should be happy and congratulations to the club and everybody associated with Barca.
"We've had the best year in the history of the club."