PCB dropping detection system for manufacturing equipment

A PCB dropping detection system for manufacturing equipment is configured to detect the dropping of a PCB on manufacturing equipment and includes a light detector and a signal processor. The manufacturing equipment includes a conveying track and has a sidewall. The light detector includes an emitter disposed below the conveying track and emitting a detecting light parallel to the conveying track to the side wall, and includes a receiver configured to receive a reflected light of the detecting light and having an install distance with the emitter. The emitter and the side wall form a preset reflection distance. The reflected light and the connecting line of the receiver and the emitter form a reflected angle. The signal processor computes a reflection distance according to the install distance and the reflected angle. The signal processor generates a PCB dropping signal when the reflection distance is different from the preset reflection distance.