Surveillance video shows the 2-year-old in the street last week in the city of Foshan.
The footage shows the girl getting struck by a hit-and-run driver. Eighteen people walked past the stricken child but offered no help.
She was then hit by another vehicle.
State media said the girl's father was tending the family's hardware shop at the time of the accident and her mother was busy hanging laundry. Both failed to notice she had wandered outside.
The toddler was pronounced dead Friday.
The tragedy has set off a national debate about a decline in morality in China.
Police have detained the drivers of both vans on suspicion of causing a traffic accident but have not said what formal charges they would face and if manslaughter would be among them now that the girl has died.
The Associated Press contributed to this report.