Walking out to open with Amy Satterthwaite, Kerr became just the second women cricketer, and seventh overall, to go past the 200-run mark in one-day global cricket.
Kerr's onslaught is also the third-highest individual score by a man or woman in one-day global history.
Kerr also starred with the ball, taking five for 17 in seven overs as New Zealand went on to beat Ireland by 305 runs after dismissing the hosts for 135 in Dublin.
Kerr batted through the innings and surpassed the 229 not out set by Australia´s Belinda Clark against Denmark in 1997 with a four-four-six sequence from the final three deliveries as New Zealand posted 440 for three.
Teenage cricket sensation Amelia Kerr celebrated her stunning world batting record by having a snooze in the middle of the White Ferns' match against Ireland.
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New Zealand's Martin Guptill scored an unbeaten 237 against the West Indies in Wellington in 2015.
She is the youngest double centurion in all worldwide cricket.
"It's pretty surreal. The day couldn't go any better".
Asked if her approach had altered after she reached three figures, Kerr replied: "Not much changed too much; I just wanted to keep batting".
She had no idea which records were tumbling as she peppered the Clontarf Cricket Club boundary with 31 fours and two sixes.
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"I didn't get off to a flyer, I had to work hard".
"I will sleep well, I have to stay up until 10 o'clock to finish (reality TV show) Love Island but then we'll be in bed", Kerr said.
"I could hear announcements [about her records] being made over the loudspeakers but I couldn't hear because of all the clapping".
Kerr's innings was far and away the largest of a fledgling, yet impressive career which had seen her become known primarily as a leg-spin bowler.
The teenager's record-breaking innings came less than a week after her unbeaten 81 helped New Zealand to 490-4, the highest team score in all ODI cricket, in the first ODI against Ireland. The White Ferns are about to play England and South Africa in a tri-series.
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