Winx's achievements will be celebrated with her image on a $1 postage stamp to commemorate her Australian record 26th consecutive win.

Australia Post has announced it will release a commemorative stamp in honour of the mare who racked up her 19th Group One win in the Winx Stakes at Randwick on Saturday.

"It is a fitting tribute to such a significant sporting achievement and amazing racehorse," Australia Post philatelic manager, Michael Zsolt said.

"The beautiful artwork on the stamp, and what it represents, will no doubt appeal to horse racing enthusiasts and collectors alike."

The stamp features Hugh Bowman riding Winx.

"She's really become an Australian icon who'll be remembered for generations," Bowman said.

"For her to be commemorated in this manner is a great honour and a very worthy distinction."

Winx is owned in partnership by Magic Bloodstock Racing, Debbie Kepitis, and Richard Treweeke, and trained by eight-time Sydney premiership winner Chris Waller.

The stamp issue will be available online and by mail order from August 20 and in post offices from August 23.