The incident occurred when the man, a robotics company employee in his 40s, was inspecting the robot.
The robotic arm, confusing the man for a box of vegetables, grabbed him and pushed his body against the conveyer belt, crushing his face and chest, South Korean news agency Yonhap said.
He was sent to hospital but later died.
People have been getting crushed by machines since the industrial age began; machines are inherently dangerous, there is so much that could have been done to prevent this from happening.