The New Zealanders led 40 points to 7 at half time and scored 11 tries in total including a hat trick to Wellington hooker Asafo Aumua.
New Zealand remain as the most successful team in U20 Championship history as they now have achieved six titles from their seven previous finals. The side's only final loss was to South Africa in 2012.
New Zealand coach Craig Philpott gave his assessment on his team's dominant final performance of the Championship.
"It's pretty exciting to be honest, it's not every day that you get to say that you're World Champions.
"New Zealand have a proud history in this final as have England so we are really proud that we are going to be taking some silverware home."
England's head coach Ian Vass said it was a tough final for his side.
"From our point of view we've had a tough road here and I think that it told maybe.
"New Zealand's physicality was a notch up from ours but not taking anything away from our guys who came back in the second-half and showed what a good team they are."
South Africa beat France 37-15 to finish third.
Photo: PHOTOSPORT New Zealand Under 20 captain Luke Jacobson