The invention discloses an elevator vacancy display device which comprises a gravity sensor, a controller and a plurality of display screens. The gravity sensor and the controller are arranged on the bottom of an elevator lift car. The number of the display screens is the same as that of floors where an elevator needs to stay, and the display screens are arranged outside elevator openings of the floors where the elevator needs to stay. The gravity sensor can sense the weight borne by the lift car in real time, and gravity data are sent to the controller. The controller converts the gravity data into the actual bearing number of people, subtracts the actual bearing number of people from the rated bearing number of people of the elevator, and sends the remaining number of people to the display screens to be displayed. The elevator vacancy display device can display the current bearing capacity of the elevator in real time, the time of people waiting for the elevator is saved, and the operation efficiency of the elevator is improved.