The incident happened at the top of High Street on Monday evening, just a few hours before the start of the monthly meeting at 7pm.
Parish-council chairman Robert Donkin said: “The tree has been vandalised. At about 5pm, three young children – who were not very old – were pulling the tree lights and shaking the tree. The lights have been tampered.”
The parish council said it was very disappointing and Coun Rosanna Reid described the incident as a real shame.
Wooler’s Christmas lights were switched on at the start of the month.
Sea fret - a look at the foggy phenomenon which spoils sunny days in Northumberland
Police seize large drugs haul in north Northumberland
Six people and a dog rescued from stranded vehicles on Holy Island causeway
Crossing closure will make railway line like the 'Berlin Wall' claims Blyth resident
Ashington FC to release new Ireland-inspired away kit in tribute to Jack Charlton
Coun Donkin thanked everyone who helped with the festive illuminations.
Coun Reid praised the lights, saying: “They are the best they have ever been. They are fantastic.”