Blaauw will join the RaboDirect PRO12 side next month and will replace Welsh prop John Yapp, who has joined London Irish on a season-long loan.
Edinburgh head coach Alan Solomons believes the 27-year-old will enhance the side's scrummaging power in the coming campaign.
He said: "I've seen a lot of Wicus. He's played a lot of games at a high level, for both the Western Province and the Stormers, in South Africa's premier provincial and Super Rugby sides, as well in the French Top 14 and Heineken Cup.
"He's a very strong loosehead prop and is very good at his core roles, especially scrummaging. I believe he will be an asset."
Blaauw started his career with the Leopards in the Currie Cup's first division before joining Western Province, with a call-up to the Stormers coming in 2008.
He spent four seasons at the Cape Town-based side before moving to French Top 14 side Biarritz, where he played 15 times and experienced Heineken Cup action.
Blaauw is now looking forward to the next chapter in his career, saying: "It's a new challenge and I'm really looking forward to bringing something to the team, while I also think it's the right place to help me improve as a player.
"I love scrummaging, I love running with the ball, and I love tackling. These are all things you have to do well and are things I'm looking forward to doing for Edinburgh as part of solid tight five.
"If we (the tight-five) can work well together as a unit, we can help lead the team forward and lay a platform that will help us improve as a club."
- Sports & Recreation
- Heineken Cup
- RaboDirect PRO12