The Scot only became eligible to play senior golf when he turned 50 in June and his win at Woburn has come in just his seventh event.
This week was the first time Montgomerie had played in a standard European Senior Tour event after spending most of his time on the Champions Tour in the United States but rounds of 68, 68 and 70 saw him ease to victory.
The eight-time Order of Merit champion got off to flying start in his final round with a birdie on the first and when he claimed an eagle three on the fifth he looked to be romping it.
A birdie on 10 just underlined his dominance and, despite two bogeys on the way home, the 2010 Ryder Cup captain was too far ahead to be caught as he finished on 10 under.
Englishman Paul Wesselingh and Spaniard Miguel Angel Martin were Montgomerie's nearest challengers on four under, with Wesselingh firing a 66 on Sunday, the low round of the week.