The 31-year-old who was released by Chiefs at the end of the season has penned a two-year deal with the KwaZulu-Natal club.
Speaking to the AmaZulu website, Booysen said he was looking forward to playing in front of the passionate Usuthu supporters.
“Where it comes to the AmaZulu family, it has always been a pleasure playing against them. It’s going to be nice playing for them now,” said the former Ajax Cape Town defender.
“I can see that they support, they stick to it, they stick with the players.
“It’s always good because you can see that they’re passionate, they’re always there through the ups and downs, and that is something that you can take.
“Obviously, that is why you want to play as a footballer, always for the team and for the supporters to keep them happy and keep them coming to the field.
“From my observation, I can see they’re passionate about the team, they love the club.”
Booysen could make his debut for AmaZulu when they take on his former club Sundowns in a Telkom Knockout clash on Sunday.