She was rushed to hospital but was sadly pronounced dead.
A spokeswoman said: "We attended the incident this morning at Gorleston beach, involving a patient using inflatable equipment".
The East of England Ambulance Service said it received more than a dozen calls related to the incident, according to PA.
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The young girl was taken to the James Paget Hospital but died.
"A parent myself, I can't imagine the grief being experienced by the family during this hard time".
A police cordon remains at the scene while enquiries continue. She'd been playing on the trampoline in a section of the beach called Bounce About, which also has an inflatable slide, traditional trampolines and a rodeo ride.
One witness claimed in a post on social media that the bouncy castle in Gorleston had "exploded" and that the child was thrown several feet into the air, the Evening Standard reported.
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The owner of the bouncy castle reportedly said it exploded because of the heat.
Earlier this year, a United Kingdom couple was found guilty of the gross negligence manslaughter of a girl who died when a bouncy castle she was in blew away with her trapped inside it.
A joint investigation into the death of the girl - who was visiting the beach with her family from Suffolk - has been launched by police and the Health and Safety Executive.
Robert Halfon said the Government needed to assess the inspection regimes of bouncy castles and consider placing a ban on them until it was certain they were safe.
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Summer Grant was killed after a bouncy castle that had not been properly secured to the ground blew away at an Easter fair in Harlow, Essex, a trial at Chelmsford Crown Court heard.