The first entry will be posted on August 9, exactly 70 years to the day since the author of Animal Farm and Nineteen Eighty-Four wrote it.
Running until 1942 the diaries cover the start of the Second World War as well as Orwell's own travels to Morocco following the illness and injuries he sustained while fighting in Catalonia during the Spanish Civil War.
His political musings, which begin on September 8 1938, give a unique insight into Orwell's views on communism, fascism and the press.
The diaries will be published on the website for the Orwell Prize, which is awarded for political writing.
Born Eric Arthur Blair in 1950, the Eton-educated novelist is one of the Britain's most influential writers.
Foremost a political writer, he wrote his first book, Down and Out in Paris in London, first-hand account of his self-imposed poverty, in 1933.
Prof Jean Seaton, the director of the Orwell prize, said: "Orwell's diaries are eyewitness accounts from the frontlines of the 1930s: unemployment, gossip, fascism, communism - and chicken farming.
"All of these issues - at home and abroad - are seen through the passionate/dispassionate eye of a great writer and a decent man."
