The Free State side started the tournament with a draw against AmaTuks before hammering Moroka Swallows 8-0, and today it was another easy three points.
Lethola Mofokeng was the hero with a hat-trick, scored inside the first half.
He opened the scoring on the half-hour mark from a free-kick, before getting his second on 35 minutes following a solo run.
The hat-trick was complete just before the break, with Polokwane netting a late consolation through Brian Dolama.
The result sees Celtic extend their lead at the top of Group A.
Celtic starting XI: Tumelo, Morena, Kgoadi, T Chaine, Phungulwa, S Chaine, Khasipe, Lethola, Letuka, Mereko, Njoti
Polokwane starting XI: Mashia, Mashabaphala, Bapela, Seete, Hlongwane, Khoza, Msibi, Nxumalo, Gopane, Ngubo, Dolama