The 'A-Team' singer's LP boosted back to pole position from last Sunday's nine, having first landed at number one upon its release 15 weeks ago.
Sheeran wrote on Twitter after the announcement: "My album '+' is number one in the UK album charts again. I couldnt ask for a better start to a new year, thank you all so much...this wouldn't have happened without you lot, give yaselfs a pat on the back *pat pat pat*."
The runner-up spot is also claimed by an advancing old favourite, Doo-Wops & Hooligans by Bruno Mars, which is up from its previous finish of 11 in its 51st week on the chart.
Elsewhere, Lioness: Hidden Treasures by the late Amy Winehouse slips from second place to five, while Rihanna's Talk That Talk and Rebecca Ferguson's Heaven fall two apiece to seven and nine, with One Direction's Up All Night rising the same number to sit between them at eight.
The big movers continue further down the chart, as Jessie J's Who You Are returns to the Top 10 after climbing four from 14, Lady GaGa advances from 21 to 11 with Born This Way and Beyoncé's 4 follows at 12 after gaining 14 positions.
Westlife, meanwhile, drop back out the best sellers with their Greatest Hits collection, down five to 13, Kasabian re-enter at 14 with Velociraptor and last week's number one Michael Bublé crashes a mighty 14 entries to 15 with his Christmas album.
Will Young's former chart topper Echoes lands at 16 after climbing nine, JLS come next with Jukebox, which is down from 13 to 17, and Rihanna achieves a second entry in the Top 20 with her fifth studio album Loud. The Bajan star's November 2010 release is up an impressive 20 places to 19.
The Top 10 in full:
1. (9) Ed Sheeran: '+'
2. (11) Bruno Mars: 'Doo-Wops & Hooligans'
3. (4) Coldplay: 'Mylo Xyloto'
4. (3) Olly Murs: 'In Case You Didn't Know'
5. (2) Amy Winehouse: 'Lioness: Hidden Treasures'
6. (6) Adele: '21'
7. (5) Rihanna: 'Talk That Talk'
8. (10) One Direction: 'Up All Night'
9. (7) Rebecca Ferguson: 'Heaven'
10. (14) Jessie J: 'Who You Are'
Source: Official Charts Company
> This week's singles chart
Watch the video for 'Lego House' from Ed Sheeran's number one album + below:
View the latest Official Top 100 Album Chart