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Ms Sun fell after her acrobatic partner failed to catch her with his legs during a stunt. She was rushed to a hospital but died of her injuries. News website The Paper reported that she leaves behind two children.
Officials said that an investigation is underway into the incident.
The horrifying video has sent shivers across the internet.
According to The Paper, Ms Sun and her husband surnamed Zhang, had worked together for many years. They have performed several stunts together without safety belts.
The news website further reported that the couple were arguing at the time of the incident. Although the female performer was told to wear safety lines, she allegedly
However, the husband has denied fighting with his wife, according to Yangzi Evening News. "We were always happy together. There was no fight."