Lewis' latest single, 'Bleeding Love', entered the UK chart at number one on Sunday, garnering 106,000 digital downloads to date. Take That's 'Rule the World', entered the charts at number two.
Combined download figures for this week's UK singles stand at 1.7m, eclipsing the previous record of 1.5m set when the Sugababe's 'About You Now' went to number one last month.
Lewis, who won the third series of 'X-Factor' in December 2006, sold more than 106,000 downloads of 'Bleeding Love', on top of 112,000 CD singles. This gave her a combined figure of 218,000 units for the week -- outselling the rest of the top five put together.
The strong performance of Lewis combined with heavy radio playlist rotation of singles by Take That and MyFly, whose single 'The Heart Never Lies' entered the singles chart at number three, have helped to make it a bumper week for digital download figures.
Digital downloads were incorporated into the official UK singles and albums chart in April 2005.
It is not the first time Lewis has been involved in setting a new record for UK digital downloads: her debut single, 'A Moment Like This', attracted 50,000 downloads in less than 30 minutes of the track being released, which is believed to be a UK record.
The Official UK Charts Company said Lewis' 50% ratio of CD and digital download sales proved there was still a healthy market for physical releases among the UK music buying public, following the introduction of the technology in September 2004.
Geoff Taylor, chief executive of the British Phonographic Industry, added: "Just three years ago, sceptics forecast the death of the single but instead singles have gone from strength to strength.
"New digital music services have combined with existing music stores to give music fans unprecedented choice as to how they discover, sample and buy new music.
"British pop fans still love to buy physical singles, which speaks volumes for the quality of the music and the important role British retailers play in supporting home talent."
Last month, British indie rock band Radiohead caused controversy among music retailers and critics by making their latest album 'In Rainbows' available from their Fans were able to choose how much they wished to pay for the release. The average paid for the album was around £4.
Meanwhile, the Official UK Charts Company has said it will launch the first chart tracking service, which works across services such as Napster UK, MSN's Music Box and Vodafone's MusicStation by the end of the year.
The organisation said the chart would provide better understanding of subscription-based models and their part in music buying habits.
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