Juventus and Napoli have yet to officially announce the move, which was instead published on the 'transfers' section of the official Serie A website www.seriea.it.
Napoli had slapped a 94.7m euros buyout clause on Higuain's contract after he hit a record 36 goals in the league last season.
But after weeks of negotiations, Juventus finally buckled to capture the 28-year-old striker whom they believe can make the difference between success and failure in the Champions League next season.
Reports on Tuesday said Juve CEO Beppe Marotta had negotiated with Napoli president Aurelio De Laurentiis to pay the transfer fee over two instalments.
Higuain will be expected to partner fellow Argentina striker Paulo Dybala, who in his maiden season with Juventus, was their top scorer with 19 league goals.and failure in the Champions League next season.