The boy, 16, was forced to change schools from Hoerskool Transvalia in Vanderbijlpark due to constant bullying, the mother told the Sowetan newspaper.
She said the group of bullies called her son a “k*****”, stripped him naked, asked what a “k*****” was doing at a white school and forced him to drink his own urine.
A meeting was held, in Afrikaans, with the school governing body and a Sedibeng municipal official. It was adjourned until October 3 as the mother needed to bring in an interpreter.
The mother says her son had since attempted to commit suicide, the newspaper reported.
When principal Johan Venske was approached for comment by the newspaper, he referred questions to the provincial education department.
Department spokesman Gershwin Chuenyane said an independent team of investigators had been appointed to look into the matter.
The mother has also opened a case of assault with Vanderbijlpark police.