The event runs from 9am to 6.30pm each day at the South of England Showground, Ardingly.
It will be a little different this year, with restricted visitor numbers because of the Covid-19 pandemic.
But organisers say the 2021 show will take visitors back to the event’s roots with agriculture, country pursuits, displays and demonstrations.
We’re taking a look back ourselves with a selection of pictures from shows over the past two decades.
1. Gardening gold medal
South of England Agricultural Society committee chairman Brian Jeffries presents a gold medal to Richard Hilson from the National Vegetable Society at the 2013 show. Picture: Susan King
2. Cute cows
Plumpton College students at the 2013 South of England show. Picture: Susan King
3. Bell ringers
The Sussex County Association of Change Ringers at the 2013 show. Picture: Susan King
4. Winnie the Pooh
Children enjoy a Winnie the Pooh display at the 2014 show. Picture: Peter Cripps