The 49-year-old is being punished for an hour-long video criticising the refereeing in July’s first-Test defeat by the British and Irish Lions.
World Rugby found the video contained “multiple abusive and insulting comments and attacks on the officials”.
And it described his offences as “especially serious and egregious”.
Erasmus, who has said he intends to appeal against the punishment, is banned with immediate effect, meaning he will not be part of the Springbok backroom staff for his team’s Test against England at Twickenham on Saturday.
However, he has been conspicuous at many of the Springboks’ games, most recently Saturday’s win over Scotland, working as a water carrier for the team.
In addition to his bans, Erasmus and the South African Rugby Union are both required to issue full public apologies to the officials, who were led by Australian Nic Berry, within a fortnight.
World Rugby’s independent committee found that “Erasmus appears not to appreciate the corrosive effect his behaviour has on the game more widely, as well as the viewing public and press”.
Erasmus’ video highlighted 38 incidents that he felt his side had been on the wrong side of, and also claimed that Springbok captain Siya Kolisi had not been treated with the same respect afforded his Lions counterpart Alun Wyn Jones.
World Rugby revealed that the video appeared online after Erasmus telephoned Berry demanding a meeting to discuss his performance.
World Rugby’s verdict stated the video was “not an objective analysis of the refereeing seeking explanations, discussion, correction.
“Rather it lacked perspective, impartial analysis or balance.
In places it is sarcastic.
In giving evidence on the case Berry accused Erasmus of “character assassination”.
He also accused Erasmus of doing his reputation “immeasurable” damage through his video
“I have spent many years trying to build my reputation as an international referee and in the course of his video which was posted online, Mr Erasmus has caused it immeasurable damage,” he said.
“I feel that regardless of the outcome and any sanctions imposed, my reputation as a referee and person will forever be tarnished.
“The whole situation has been an extremely difficult time for my family and I” he said.
Rassie Erasmus banned from rugby for two months by World Rugby