Voice said the victory was "a big deal" after narrowly going down in the final of the 2013 Oceania Championship in Cairns, Australia.
"That gutted me, so my main mission this year has been winning this title - this is a big deal for me," Voice said.
During the final Voice said he had tried different tactics that weren't yielding a result until he spotted a gap and snatched it.
"I had been trying certain moves, but they weren't working and then I saw an opening and grabbed it. I managed to lift him and flip him flat on his back and that was probably the deciding factor.
"The win was so important for me, this is my last year in the cadet division."
Voice and fellow Wanganui club mates will now focus on the upcoming North Wellington event being held in the Wanganui High School hall next weekend (May 10-11).
"I will be competing as well as doing a bit of officiating. The North Wellington event should be a great spectacle.
"There will be competitors of all ages and grades from throughout the country here," Voice said.