The events, which will include pony rides, circus skills and fair ground entertainment, take place on Wednesday 11 August and will be attended by North Tyneside’s elected mayor Linda Arkley.
Local people joined the community group Friends of Northumberland Park and the council’s park wardens to help clean up the site this weekend, in anticipation of the festivities.
The anniversary celebrations follow the local authority being awarded £109,000 from the Heritage Lottery Fund in July to develop its bid for £2.2 million for a restoration project.North Tyneside's elected mayor Linda Arkley, said: "We are delighted that people continue to enjoy the borough's parks and make use of the great recreational spaces North Tyneside has to offer.
"The family fun day is a fabulous way to celebrate Northumberland Park's 125th anniversary, and the clean-ups being carried out by Friends of Northumberland Park and the council will no doubt get the park looking its best.
"The park certainly has a feel good factor at the moment following the announcement from the Heritage Lottery Fund, which enables us to progress our regeneration plans."
The family fun day will also include a performance from a Northumbrian pipe band, story telling in North Tyneside's Mobile Children's Library, police officers carrying out bike stamping and Friends of Northumberland Park hosting a tombola and bookstall.