"I watched my ticket as one number circled, then two, three and four, until all of the numbers were staring back at me.
"I couldn't believe it, I sat bolt upright and kept saying 'oh my goodness' over and over – you never think it's going to be you."
He said he was left in shock when he saw $7,333,333 stamped at the top of his electronic ticket.
With his win claimed, the man carried on with his usual Sunday routine.
"It was so hard keeping it to myself while I was around town on Sunday."
The Timaru man said the win would really help his family - but he had yet to tell them of his good fortune.
"I can't wait to see the looks on their faces when I share the news.
"I'm also looking forward to doing some fun stuff like taking some trips overseas, but I think I'll start right here in my backyard with a scenic flight around the beautiful South Island."
This is the 10th time Powerball First Division has been struck in 2022.