The middleweight fighter filmed himself placing two huge wagers of £50k and £20k – that would have won him £166k – on his good friend to dethrone Wilder of the WBC title earlier in the week.
After a boxing masterclass by Fury, 30, it looked as if Saunders was quids in.
But the judges' controversial split-decision to call the fight a draw has left him massively out of pocket.
The 29-year-old, along with the rest of the boxing world, furiously branded the decision a "robbery".
Saunders, who also lost £22k in a casino in October, tweeted: "The best HW I’ve seen with my eyes #Robbery"
Wilder, 33, vowed to make Saunders regret his wager – and managed to do so by knocking the 6ft 9in Gypsy King down twice.
He said: "That's a stupid move.
"He shoulda kept that money. When he become broke he gonna remember what he did.
“That’s stupid, that’s stupid, I’mma make sure he regret it. I’mma make sure that he don’t make no money.
“I promise him that, I guarantee you that, you made a stupid move.”
Saunders, who's fight against Demetrius Andrade in October was cancelled after he was denied a boxing licence, and Wilder have clashed in the past – in an infamous incident at a Nando's in Belfast.
Fury, who battled depression, alcohol and drug abuse, was on the brink of one of the greatest comebacks in sport when judges amazingly deemed the fight to be a draw.
The scorecards read 115-111 in favour of Wilder, 114-112 Fury and 113-113.
Fury reckons everyone at the Staples Center in Los Angeles could see he won the fight.
He said: "We're on away soil, I got knocked down twice but I still believe I won the fight and I believe every man in here thought I won that fight tonight.
"But I'm showing total professionalism here, I'm a true champion and a true warrior. I went to Germany to fight Klitschko, I've come to America to fight Deontay Wilder. Bless Deontay Wilder, he's a top fighting man.
"I was never going to be knocked out tonight. I got put down with some good shots, I showed good heart to get up. I came here tonight and I fought my heart out."
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