Andy Robinson scored the last goal ever at the Vetch Field as Swansea said farewell to the Vetch in style by adding their first FAW Premier Cup trophy to League One promotion.
Striker Juan Ugarte gave Wrexham the lead, firing home after Dennis Lawrence freed him with a run to the by-line.
But ex-Wrexham man Lee Trundle inspired a comeback, his attempted cross headed in by Shaun Pejic for a cruel own goal.
Trundle then controlled a long ball and freed substitute Andy Robinson, whose powerful left-foot volley won the game and sparked wild celebrations.
While this was Swansea's first win in three finals, it denied Wrexham a third successive title and a sixth overall.
It could have gone either way, but perhaps this was meant to be in the last game at the Vetch
But nothing could dampen the enthusiasm of a 9,000-strong Swansea crowd, witnessing the final game at the Vetch before the 93-year-old ground is demolished, with the club moving to the new stadium in Morfa next season.
