The President appointed Le as the country's envoy, replacing Wei Wei, state-run Xinhua news agency quoted a statement from the Standing Committee of the National People's Congress (NPC), China's top legislative body.
Le was earlier China's assistant minister of Foreign Affairs. Prior to his arrival in New Delhi, he served as the China's ambassador to Kazakhstan.
Xi is scheduled to arrive in India tomorrow on a three-day visit as part of his four-country Asia trip.