They were arrested on Tuesday, SANParks rangers commander Maj-Gen Johan Jooste said in a statement.
Rangers seized poaching equipment, an axe, and were searching for a firearm.
“Every individual we arrest, and all the weaponry we confiscate from the syndicates, gives us more energy and hope that one day, we will overcome this war and save our natural heritage,” he said.
South Africa is home to around 80 percent of the world’s rhino population, estimated at more than 25,000.
The Kruger National Park, which borders Mozambique, is worst affected, having lost over 500 rhino since January.