Next year's event will take place between 19 and 22 April, bringing around 1,800 delegates into Brighton.
Howard Barden, Brighton & Hove City Council's head of tourism and venues, said: "Since the NUT's previous event held at the Centre, we have undertaken an extensive refurbishment.
"With many different aspects to the conference, our facilities are now able to make the proceedings more comfortable and convenient.
"We are also able to offer more spaces for meeting and workshops, alongside additional breakout and exhibition areas."
Karen Handley, the NUT's conference organiser, added: "Our annual conference is a major part of our union's calendar. It allows Union members to gather and debate education policy."