Mall surveillance footage from Saturday, August 1, 2015 shows the man, a 35-year-old cleaner named Zhang, falling and becoming trapped after one of the escalator floor panels collapses.
The incident took place in Shanghai's Cloud Nine mall in Zhongshan Park. It's the third escalator-related accident in China that resulted in a serious injury or death this past week.
State media reported that the cleaner had violated standard regulations and should have stopped the escalator before cleaning it.
Firefighters eventually free the man who is sent to hospital. However, his injuries are so severe his left leg is amputated below the calf.