"By the end of April 2015 the number of rhino we lost to poachers was 393 for the whole country," Environment Minister Edna Molewa told a press conference in Pretoria, adding that 290 of them were poached in the Kruger National Park.
The figure is a more than 18 percent increase over the first four months of 2014, when 331 rhinos were poached including 212 in Kruger, she said.
Despite the appointment of an ex-army general to oversee anti-poaching operations, a new record is set each year in the number of rhinos killed as cash-strapped South Africans and Mozambicans join the lucrative trade.
A total of 1,215 rhinos were killed in 2014, compared with 1,004 in 2013, 668 in 2012 and 448 in 2011.
More From This Section
The numbers began surging in 2008, which saw 83 rhinos killed compared with just 13 the previous year.
The public briefing today on rhino poaching was the first the South African government has given in months.
"We are soldiering on, we do think that this fight will have to be won and we will win it," she added.
Since 2008, South African authorities have struggled to contain the carnage despite moving some animals out of poaching hot spots in Kruger.
South African police commissioner Riah Phiyega reported that, as of the end of April, park rangers detained 132 suspected poachers, crediting the use of helicopters and anti-poaching dogs for an uptick in arrests.
In South Africa, many people buy beaded "Rhino Force" bracelets and affix life-sized red plastic rhino horns to the bonnets of their cars in support the anti-rhino poaching cause.