Five of the 11 concerts featuring artists from the BBC show will no longer take place and people already with tickets are set to be refunded.
The axed shows were due to take place at the 02 Arena in London (September 15), The Brighton Centre (September 17), the AECC in Aberdeen (September 22), Newcastle's Metro Radio Arena (September 23) and Manchester Arena (September 26).
The tour is still scheduled to begin at the Bournemouth International Centre on September 12 and will later visit Cardiff, Birmingham, Glasgow, Liverpool and Sheffield.
A spokesperson confirmed to Digital Spy: "Unfortunately, The Voice UK Live has been cancelled due to lack of ticket sales - customers are advised to contact their point of purchase for ticket refunds."
The announcement follows reports last week that the Voice tour, which will feature the show's final eight contestants, has failed to sell out a single venue.
Further embarrassment hit The Voice recently when its first winner Leanne Mitchell failed to crack the Top 40 with her cover of 'Run To You'.
However, the series did celebrate being named as the BBC's biggest entertainment launch in a decade, with average ratings higher than the debut series of The X Factor, Strictly and I'm A Celebrity.
Watch the music video for Voice winner Leanne Mitchell's 'Run To You' below: