Bristol-born Pearson, who broke her neck in a car accident at the age of 17, was forced to quit wheelchair racing after being told the risk of further injury was too great and only took up throwing 18 months ago.
The 26-year-old from Herefordshire launched the disc out to 6.38, 6.54 and then 6.58 metres with her first three throws of the competition, extending the F51 record on each occasion. She said: "In training I was consistently throwing over the world record, so I knew it was a definite possibility I could do it. To get that first throw and break the world record was a relief. I was able to relax and my next two throws were even better."
Meanwhile, Scots Paralympic swimmer Andrew Mullen finished a creditable fourth in the S5 50m butterfly as the 15-year-old concluded his Paralympic debut.
The Glasgow-born teenager who learned to swim at Tollcross Leisure Centre in his home city had set a personal best yesterday morning, dipping under the 40sec mark.
Although he could not repeat the feat, Mullen finished in a highly creditable 40.04.