He smashed record after record as he swept aside Croat Marin Cilic in straight sets on Centre Court.
His four children were brought into the players’ box to join in the celebrations.
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Federer was overwhelmed as he caught a glimpse of identical twin daughters Myla Rose and Charlene Riva, who are eight next Sunday, and three-year-old twin sons Leo and Lenny.
The girls, wearing matching dresses, and the boys, dressed in smart blue blazers, looked on at proceedings with mother Mirka, 39.
“They have no clue what’s going on,” Federer said. “I think the younger twins think this is probably a nice view and a nice playground.
Roger Federer's four children reduced him to tears after his eight Wimbledon win
Hopefully one day they will understand. It’s a wonderful moment for the family
“Hopefully one day they will understand. It’s a wonderful moment for the family. This one is for us.”
The drama unfolded as Federer won sets 6-3, 6-1, 6-4 in one hour 41 minutes. It was played out in front of the Duke and Duchess of Cambridge, both 35.
Kate, who is patron of the All England Club, kissed Federer to congratulate him. She had attended the first day of the tournament although William was making his first visit.
Wimbledon winners through the years Sun, July 16, 2017
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Express Sport takes a look back at all those players who have won at WImbledon over the years.
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2017 – Garbine Muguruza
Sister Pippa, brother James and mother Carole also cheered.
Theresa May watched from the Royal Box along with a supporting cast of stars including Eddie Redmayne, 35, Bradley Cooper, 42, and Hugh Grant, 56.
Fellow stars Uma Thurman, 47, Sienna Miller, 35, and former Dr Who David Tennant, 46,were in the crowd along with former Ukip leader Nigel Farage.
Federer now holds a record 19 Grand Slam titles and at 35 years 342 days, he becomes the oldest man in the modern era to win Wimbledon.
Kate and William enjoyed the light-hearted tennis moment
Incredibly, he won the championship this year without dropping a set in any of his matches.
But opponent Cilic, 28, had been struggling with his emotions as he realised his dreams were unravelling.
He broke down in tears during the changeover as he struggled with a blister. But, ultimately, it was Federer’s day.
He summed up his record-breaking victory saying: “It’s magical, I can’t believe it yet. It’s too much really.”