An anti-Uber activist who was slapped with a court order banning him from intimidating and harassing drivers has been ordered to pay almost $400,000 in legal costs, in the final chapter of a protracted court battle.

Russell Howarth, a self-proclaimed anti-Uber advocate who performed citizen's arrests in a campaign against the ride-sharing service, was permanently restrained by the Supreme Court in April from threatening or harassing Uber drivers and users of the app.

Mr Howarth, an undischarged bankrupt, represented himself during the bulk of the proceedings while Uber was represented by three barristers including Sydney silk Bruce McClintock.

In a decision last week, Justice Michael Slattery ordered Mr Howarth to pay $391,152 in costs, representing about 60 per cent of Uber's total legal bill.