About 4500 sheep and lambs will be shorn by competitors from 32 countries at ILT Stadium Southland from today until Sunday.
It's the 40th anniversary of the championships.
The world council has 13 financial member countries which can apply to host the event.
Traditionally hosting rights are shared between northern and southern hemisphere member nations.
This year's champs were initially earmarked for Australia, but when its bid couldn't go ahead Shearing Sports New Zealand applied for and was awarded hosting honours for the fifth time.
All previous New Zealand events have been held in Masterton.
A large number of trade exhibits are also on display at ILT Stadium Southland.
The Trade, Craft and Wool Expo will be held at the community courts from Thursday to Sunday.
Jason Kerrison from Opshop, country-rock's Jody Direen and Jenny Mitchell will perform at the champs.
