Kerr amassed the record total just days after her team's 490 for four against Ireland set a record for cricket's highest-ever one-day global total.
Amelia Kerr has broken the women's world record for the highest ODI score with 232no.
Kerr then had a mid-game nap before returning to the field to claim 5-17 - clean bowling all of her victims - as Ireland were skittled for 135.
Australian Belinda Clark no longer holds the record for the highest score in women's one-day internationals following a phenomenal knock from New Zealander Amelia Kerr. Rohit Sharma (264) and Martin Guptill (237) are the top two batsmen in the list. At 17 years & 243 days, Kerr also became the youngest double-centurion in worldwide cricket - men and women included.
"It was pretty surreal". The double came in the 46th over, through another boundary shot, off 134 deliveries - also a record in women's ODIs.
"I didn't get off to a flyer, I had to work hard".
Asked if her approach had altered after she reached three figures, Kerr replied: "Not much changed too much; I just wanted to keep batting".
"I could hear announcements [about her records] being made over the loudspeakers but I couldn't hear because of all the clapping".
"We're not surprised she's produced a performance like this - probably not as young, I didn't think it would happen as young to be honest - but we're really proud".
Kerr had previously scored 174 runs in her fledgling career, the Tawa College student having made her name as a bowler of some talent.
Victory saw the White Ferns complete a 3-0 series sweep over Ireland, with every one of those wins by colossal margins of over 300 runs. Kerr's unbeaten innings makes her only the second woman to score a double hundred in ODI cricket.