"The reserve price is too high and we have been saying that since day one," Mittal said on the sidelines of the World Economic Forum on India.
Next week, the government is auctioning spectrum at a minimum bid price of Rs 14,000 crore for 5 MHz of airwaves for all the country's 22 telecom zones.
The auction base price is more than seven times that the carriers paid in earlier sales, where airwaves were bundled with telecom permits.
Ruling out the repeat of the highly competitive bidding for the 3G and BWA (also known as 4G) spectrum in 2010, which went on for over a month fetching the government a total of Rs 1.06 lakh crore, Mittal said: "Auction will be over on first day. There is no need to be aggressive."
When asked why then Bharti is taking part in bidding if the price is too high, he said: "We didn't want to be seen as boycotting auctions."
Airtel, Vodafone, Videocon and Tata Teleservices are among the telecom biggies that have applied to bid in the auction, but Reliance Industries and Russia's Sistema surprised by staying away.
No player has applied for pan-India licence, while Airtel and main rival Vodafone have only bid for additional spectrum in select few circles. Other players like Videocon, Telenor and Idea have bid for new circles and additional spectrum.