Sandwich-board activist Danny Lim is planning to take legal action against three Sydney police officers after he was arrested and charged for offensive behaviour in Barangaroo on Friday.

Hundreds of Sydneysiders took to Sydney Police Station during a protest on Sunday in support of the 74-year-old, who is best known for his social and political messages.

The former local councillor was arrested in Exchange Place at Barangaroo about 9.20am due to his sign stating "SMILE CVN'T! WHY CVN'T?", with video of the incident reaching over a million views on Facebook.

Mr Lim’s lawyer, Bryan Wrench, said his client intends to fight the charge as well as action against the specific officers involved.