Paul Crowther, 32, will appear before magistrates in North Tyneside on 18 June.
The Brexit Party leader’s suit was left covered in the drink following the incident at around 1pm on Monday and he was quickly hurried away from the scene by staff.
Shortly afterwards, he could be heard exclaiming “how did you not stop that?” and “it’s a failure” as his staff ushered him away from the scene and into a taxi.
An empty Five Guys banana and salted caramel milkshake cup was left on the floor following the disturbance, the Press Association reports.
In a statement, Northumbria Police said: “Police have charged a man with common assault and criminal damage following an incident in Newcastle yesterday.
“At around 1pm, a 55-year-old man had a milkshake thrown at him in the city centre.
“A 32-year-old man was detained at the scene and arrested by police. He has now been charged with common assault and criminal damage.”