The Ethiopian government, which is backing the move, hopes it will prevent fraud, such as traders passing off beans from a lesser growing area as being those from a higher quality region.
Although the largest growers and co-operatives will be able to continue to sell directly to the global coffee firms, everyone else will have to use the electronic exchange.
Set up earlier this year, the exchange already trades in maize, wheat, sesame seeds and haricot beans.
Ethiopia is the birthplace of coffee cultivation and the crop continues to account for more than a third of its export earnings. It earned $525m (£354m) from coffee exports in the 2007-08 financial year.
However, Ethiopia still remains one of the world's poorest nations, and is ranked 170 out of 177 on the United Nation's Human Development Index.BBC