Two weeks earlier, Robinson broke Lisa Mathieson's 1994 record by 3sec with her time of 13min 57.72sec.
But it could not be registered as an Otago record because it was held during the New Zealand Masters Games and there were not enough walking judges round the track.
Everything was legal on Saturday and Robinson's time of 13min 42.30sec at the Otago championships is the Otago senior women's record.
Robinson (22), a physical education student, was well organised and had the lap times written on her forearm before the race.
"When I was given the lap times I knew I was ahead of the target times and the record was on," she said.
It is also a Caledonian track record and beat the 13min 51.93sec that Gabrielle Gorst (Hastings) walked when winning the New Zealand title in 2003.
It was a useful prelude for the New Zealand v Australia Challenge in Hobart next weekend.
Robinson is a member of the New Zealand team. Last year she finished third in the under-23 events and was placed seventh overall in the 20km road walk.
Hannah Blair (Taieri) won the Otago women's javelin title with a throw of 38.56m.
Blair (25), an Ashburton primary school teacher, returned to Dunedin for her first competitive throw of the season under the eye of her coach Raylene Bates.
She is confident of retaining her New Zealand title for the third successive year in Auckland at the end of next month.
Andrew Whyte (Hill City) had too much speed round the bend and won the senior men's 200m title in 22.01sec from clubmate Daniel O'Shea 22.13sec and Matthew Robinson (Southland) 22.31sec.
He also won the junior men's 400m by almost 3sec in 48.95sec.
Southland athletes Charlotte Muschamp and Greer Alsop dominated the women's 20 triple jump and smashed the Southland junior and open records.
Muschamp improved by 48cm to win the event with 12.49m and Alsop by 9cm.
They head the women's 20 national ranking list and are placed second and third on the open women's list.
Madaline Spence (Hill City) broke the 1991 Otago girls aged 14 and 15 record of Megan Fraser (Taieri) by 0.22sec when she won the Otago women's aged 15 and under 80m hurdles in 12.31sec.
Rebecca Gibson (Gore) won the women's 200m in 26.38sec from Sophie Napper (Taieri) 26.84sec and Laura McPhail (Hill City) 27sec.
The women's 20 100m was won by Megan McPhail (Hill City) in 12.57sec with Napper second in 13,17sec.
Oceania champion Liz Wilson (Hill City) won the masters women's aged 35 to 49 100m in 13.37sec and Claire Giles (Caversham) the over 50 title in 14.79sec.
