The invention discloses a use detection safety system and method for an elevator door. The use detection safety system for the elevator door comprises a sill sliding groove, a storey door leaf matched with the sill sliding groove, a door sliding block arranged at the bottom of the storey door leaf, an initiative infrared detector arranged on the sill sliding groove, and a control box used for processing signals of the initiative infrared detector. The initiative infrared detector is connected with the control box. The storey door leaf slides in the sill sliding groove through the door sliding block. When the storey door leaf is closed, the position of the initiative infrared detector and the position of the door sliding block are matched. By the adoption of the above structure, automatic detection is achieved, the detection precision can be improved, effective detection is achieved, potential safety hazards are eliminated, and the workload of maintenance personnel is reduced.