YouTube's most popular star earned $7m (£4.5m) in 2014, according to Swedish newspaper Expressen.
Felix Kjellberg, 25, known to fans as PewDiePie, records himself playing video games and uploads his reactions online.
He has 37 million followers on the video-sharing website - more than One Direction and Taylor Swift.
"He appeals to an attractive demographic of teens and young adults," said Ian Maude, from Enders Analysis.
"It's strange to imagine that somebody can earn so much from YouTube, but the equivalent of half the UK is watching his videos," he said.
Mr Kjellberg's latest video, in which he plays online game called Agario, has clocked up 1.5 million views in 18 hours.
Expressen looked at dividends paid by Mr Kjellberg's companies to work out how much he had earned.
In July 2014, Mr Kjellberg confirmed to an audience on Reddit that he had earned "roughly" $4m in 2013.
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