The prize was awarded by the National Outdoor Event Association (NOEA), a trade organisation which represents and promotes the outdoor events industry.
The award was picked up at the NOEA annual convention in Birmingham by show manager David Dunsmuir.
He said: “It is an honour to be recognised by our peers and demonstrates that we are major players in the event industry.”
The last two attendances have broken through the 180,000 mark, with a record in 2010 of 187,644.
Mr Dunsmuir added: “We realise we are competing for a share of the public’s hard-earned cash and we need to offer value for money.
“With competitively priced tickets and no more charges once you are inside the showground, we feel we offer excellent value for a full day’s interest and entertainment.”
This year’s show will be held at the Royal Highland Centre, Ingliston, from Thursday, June 21 to Sunday, June 24.