A Canberra man who was a NSW police sergeant when he tasered an unarmed Nowra man has been found guilty of perjury and common assault.

Magistrate Michael Antrum found the former-NSW police officer Nigel Alfred Davey, 47, guilty in the Queanbeyan Local Court on Tuesday.

Davey had been suspended previously for an incident involving a taser. Credit:Craig Abraham

Mr Antrum found Davey had lied to a Nowra court on October 1, 2014 when he said Regan Sutton was armed with a knife and had tried to attack him before Davey Tasered him on June 14, 2013.

It was found Mr Sutton had told Davey "f--- you" before the then-police sergeant, still seated in his squad car, tasered an unarmed Mr Sutton from five metres away.