Sisi was widely expected to win since his rival, little-known politician Mousa Mostafa Mousa, previously offered his support to Sisi and barely campaigned in the run-up to the election, Efe news agency reported.
NEA Chairman Lashin Ibrahim announced in a press conference that participation among Egypt's nearly 60 million eligible voters, both in the country and abroad, reached 41.05 per cent (24,254,152 voters), compared to the 47.45 per cent in the 2014 election, in which Sisi came to power for the first time.
Sisi received 21,835,387 votes to Mousa's 656,534.
The election was held under tight security on March 26-28 at over 13,700 polling stations, and was supervised by nine Arab and international organisations and 50 local civil organisations, as well as the Arab League and the African Union.
The NEA previously decided that eligible Egyptian citizens who abstained from voting in the presidential election would be fined 500 Egyptian pounds (about $28).