The U14 went through the pool play undefeated, and went on to beat New Plymouth BHS 32-5 in the final.
Assistant coach Murray McKenzie said the team had performed strongly throughout the tournament.
"The team was well led by captain and openside flanker, Mac Russ, and vice-captain, Rangiwai Lunjevich, at first 5-eighth," Mr McKenzie said.
"A big thanks to head coach Cameron Moorby and manager Jeremy Quigley, as well as the large contingent of parents that travelled to Palmerston North to support their son."
Hamilton Boys' High School's first XV also claimed another super eight title, beating Hastings Boys High School 13-5 in the final.