Auctioneer Aaggie Stroh, of Eli Stroh Properties, said the house was expected to raise between R1-million and R1.5-million, the Sowetan reported on Thursday.
"I can confirm that Malema's house at 23 Mopani Street at Flora Park will be on auction on July 23."
He said the house was "very nice and clean" but the economic climate could affect its value.
The South African Revenue Service (Sars) has attached properties owned by Malema in order to recoup R16-million he owes.
His household goods were sold for R54 000 in February and in mid-May his incomplete mansion was sold for R5.9-million, R2.3-million more than he paid for it in 2009.
Stroh was unable to confirm whether another house of Malema's in Seshego, Polokwane, where his grandmother lives, would also come up for auction.
Malema is expected to launch his new political party, the Economic Freedom Fighters, at Constitution Hill later on Thursday. – Sapa