Samuel Boosen was attacked Tuesday after he entered an enclosure where about eight or nine lions were being kept, Superintendent Lesego Metsi said.
Two other men were outside the enclosure at the Aloe Ridge Lodge in the North West province when the animals attacked.
"Only his spine and skull remained," Metsi told the South African Press Association.
Boosen, 36, had been working at the lodge for about four years, Metsi said.
In April, the owner of a game reserve near Johannesburg was mauled to death by lions after reportedly falling out his vehicle while having a stroke.
