Much of the destruction has been in Mato Grosso state, the centre of soya farming in Brazil.
The news comes shortly before a vote on new forest protection rules.
Brazilian Environment Minister Izabella Teixeira said the figures were "alarming" and announced the setting up of a "crisis cabinet" in response to the news.
"Our objective is to reduce deforestation by July," the minister told a news conference. Read the full report here.
Source: BBC News, U.K.