The gallery houses treasures that were found intact in 1922 along with the mummy of the 19-year-old boy king in the temple city of Luxor, and is a world famous tourist attraction.
Its renovation is part of a seven-year project to refurbish the entire Egyptian Museum overlooking Tahrir Square, and in turn revive downtown Cairo.
On Monday, Prime Minister Ibrahim Mahlab unveiled the newly renovated halls located at the eastern entrance of the Tutankhamun gallery.
The renovation of the museum has been aided by funds from the European Union and other international donors.
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James Moran, who heads the EU delegation in Cairo, said the bloc supported the project in order to help to boost Egypt's tourism sector whose "revival... is fundamental for the economy".
The EU, he added, would offer 92,500 euros ($115,000) next year to help renovate the eastern wing of Tutankhamun gallery.
The Egyptian Museum houses the largest collection of pharaonic artefacts and has witnessed several alterations since it was first opened in 1902.
Four years of political turmoil since the ouster of veteran leader Hosni Mubarak has battered the country's economy amid falling tourist revenues and investments.