The 28-year-old Pole reached the top of a 15-metre wall in 6.64 seconds in the South Korean capital, news outlets reported.
She improved on her previous world record of 6.84 seconds that she set at the Tokyo Olympics.
Mirosław finished fourth in the women's climbing competition at the Tokyo Games last year, narrowly missing out on an Olympic medal.
(gs)
Source: IAR, PAP, TVP