He and fans were overjoyed after the team defeated Forest Green Rovers 6-0.
It is the club’s first back-to-back promotion in its 159-year history.
Reynolds wrote on X, formerly Twitter: “A few years ago, if you told me I would be crying tears of joy over a football match taking place in north Wales, you would be Rob McElhenney.
The club’s co-owner and fellow Hollywood actor Rob McElhenney said on Instagram: “I don’t know if I have the words.
“The passion and perseverance that these players have is incredible to watch.”
Wrexham’s stylish victory at the Stok Racecourse, coupled with defeats for MK Dons and Barrow, meant the team secured a second successive promotion after last season’s National League title win.
The club’s supporters came from far and wide, including Monserrat Fernandez who travelled from Spain.
She said the trip was “absolutely worth it” and the game had been “brilliant”.
With five wins in their last eight games, manager Phil Parkinson said ahead of the match that Wrexham’s “destiny” was in its own hands.
Fans spilled onto the pitch after the game to celebrate.
Thomas and his son Fredrik, who travelled to the game from Norway, said they first became Wrexham fans after after watching the documentary Welcome to Wrexham.
“We’ve got autographs off Paul Mullin and Phil Parkinson today, so great,” Thomas said.
Another fan, Alan, his son Ian and grandson Jack, said the promotion meant “everything”.
“It’s our home team, it’s our life this ground,” Ian said.
