The team is taking part in four days’ of competition at the championships, which are being held at Bishop Burton College.
Chef d’Equipe Jill Barker said the team is hoping as many people as possible come to watch and cheer them on.
“They have all been working very hard for this for a number of years and this is their five minutes of fame,” she said. “They’ve had to put in hours and hours in the saddle and they are here to win medals.
“This competition is a big deal. If the local children at pony clubs have the opportunity to come and watch, this is what they will aspire to. These are the best riders in the country and they are here to represent Team GB. We want everyone to come and cheer them on.”
The GB team is competing against 15 other countries in the championships, which are free to attend for the public and include the three disciplines of eventing, showjumping and dressage.
Team member Daisy Proctor, 15, from Lincolnshire, said: “This has been our aim for so long and it is really exciting to be here representing our country.”
Connie Gill, 15, from North Yorkshire, added: “We are going to try our best and see where that leaves us. It is really cool and exciting to be competing against all the other countries here.”
Competitors aged between 12 and 16 are taking part in individual and team events throughout the week, culminating in a weekend of cross country action on Saturday and Sunday.
Fellow British Eventing Team member, Saffie Osborne, 16, from Berkshire, said she would encourage any young riders with aspirations of competing at a high level to come along and experience the championships.
She said: “I did a lot of pony club riding when I was younger. It gives you a stepping stone to go through the ranks and get to this point. I would definitely recommend coming along to see what it is all about.”