Alex Leith, area children's services manager for Merseyside and Cheshire, said the NSPCC was grateful to everybody who has helped to build the "big hug".
Children who helped design the building said they wanted it to be shaped like a curve to represent a cuddle and make them feel safe.
Mr Leith paid tribute to the generosity of John Hargreaves.
He said: "He made a huge commitment to the project right from the beginning.
"He pledged a large amount of money, when it was just an idea. His enthusiasm and belief in the project spread among the rest of us, and that is why we are here today."
NSPCC chief executive Mary Marsh, who was born and raised in Liverpool, said the centre's construction was a special event for Liverpool.
She said: "The pioneering services based here will have a major impact on cruelty to children.
"It is particularly fitting that this project is being built in Liverpool because the very first Society for the Prevention of Cruelty to Children was started in the city in 1883.
"Liverpool has a heart of gold and if any city can unite to support such a worthwhile cause, this one can."
* TO FUNDRAISE or donate to the Safe Place Appeal, ring Angela on 0800 1073790. Alternatively, email acapper@nspcc.org.uk, or write to Angela Capper at The Safe Place Appeal, 125-127 High Street, Wavertree, L15 8JS.
* Click here to watch a video report of this story
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