The lift went up for about three floors before it stopped and the woman can be seen lying on the floor and waiting for help.
She struggled to get her leg out and it appeared that the lift had crushed her right lower leg.
The video suggested that her leg was cut off completely below her knee.
It's confirmed that the incident happened on 21 June, 2017, but the footage has only been released recently.
It's said the incident took place in Conch Building in Zhongshan West Road of Shanghai.
No further information has been disclosed. It remains unclear if the woman had survived the accident.