The 22-year-old front man scored 5 goals in fifteen appearances for the White Tigers during the second half of last season having joined the club from National League side Wrexham.
Harvey (pictured) had previously been a professional with Plymouth Argyle.
Meanwhile, former Truro favourite Isaac Vassell has today made the move from SkyBet League Two Luton Town to Harry Redknapp`s Birmingham City.
The Championship outfit have paid an `undisclosed fee` for the 23-year-old striker, who scored 22 times in seventy-nine games for the White Tigers between 2014 and 2016, earning a move to the Hatters this time last year.
Vassell spent only one full season at Kenilworth Road but his performances marked him down as one of the game's most exciting talents.
Vassell, a cousin of former Aston Villa and England striker Darius Vassell, was born in Newquay and came through the youth ranks at Plymouth Argyle.