The 38-year-old took 20 minutes to score the six runs he needed having resumed with 89 to his name on the third day of the rain-delayed County Championship match at Worcestershire.
He went past the milestone with a cover drive for four off fellow Australian Matt Mason from the ninth ball he faced.
Langer, now in his 18th year in first-class cricket since making his debut for Western Australia, reached the milestone in his 615th innings compared to only 338 by the great Bradman.
After an earlier spell in county cricket with Middlesex, Langer made his debut for Somerset in 2006 and became captain in the following season.
Born in Perth, he also captained Western Australia up to the 2006-07 season.
Since his scoring a century against Tasmania in his last match for WA in March 2008, he has played exclusively for Somerset.
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