It is designed to be a 182m (600ft) high tribute to Sardar Vallabhbhai Patel, a hero in India’s independence struggle, in Gujarat state.
The “Statue of Unity”, as it is known, will be inaugurated by the Indian leader on 31 October.
Mr Patel was a deputy to India’s prime minister after independence in 1947.
The nationalist was known as the “Iron Man of India” after he persuaded feuding states to unite and become part of the Indian state after independence.
Many Hindu nationalists feel his place in history was overlooked in favour of the Nehru dynasty, which came to dominate Indian politics.
Once completed, the bronze-clad statue – which was begun in 2013 – will be nearly twice as tall as New York’s Statue of Liberty.
It is hoped the site will become a significant tourist attraction for the country’s westernmost state. The statue is located some 250km (150 miles) from the state’s main city, Allahabad.
More than 2,500 workers are working to get the statue ready in time, with several hundred migrant labourers from China also contributing to the efforts.