It's reported he got away with the child's earnings of $17.
The boy had less than $20 in cash on him, police spokesman Tony Underwood told ABC News affiliate WSOC.
Luckily, the child escaped unharmed.
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Less than 24 hours after the robbery, his mom, dad and the 9-year-old boy were out selling lemonade again.
Neighbor Kelly Smith said she noticed the boy's stand with its yellow sign offering "organic lemonade" at a traffic roundabout at the entrance to her planned community as she left to pick up her daughter at taekwondo class. "In today's world, people are very bold", he said. "That one takes it to a new level".
Smith said his son was back out selling lemonade on Sunday and will continue to sell, but they will be taking more safety precautions from now on.
Deputies found a trail in the woods where a camouflage hat, BB gun and the stolen metal tin were recovered.
Those with information that might assist detectives in this matter should contact the Union County Sheriff's Office or Union County Crimestoppers.