Human, 59, is in his first season in charge after replacing John Mitchell, who left after the last campaign to become one of Eddie Jones's assistants with England.
"It's a massive honour to be entrusted with this role, especially knowing that I have the backing of the people around me," said Human, who has won four of his first six games but saw his side thrashed 56-20 at home by Waikato Chiefs last month.
They bounced back with a narrow 19-16 away win over the Sharks in Durban on Saturday.
"It's been a good start thus far and I firmly believe that we are heading in the right direction as a team.
"However, there is a long season ahead with lots of work to be done, and I am excited to get on with things," Human said in a statement.
The Bulls have also signed prop Wiehahn Herbst, who returns to Super Rugby after spending five years at Ulster.
The 30-year-old played for the Sharks between 2009 and 2014 before moving to Irish rugby. He could be in contention for a debut on Saturday against the Jaguares at Loftus Versfeld in Pretoria.
(Reporting by Mark Gleeson in Cape Town; Editing by Christian Radnedge)
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