The invention discloses a conveying device. The conveying device comprises a conveying mechanism, guide wheels, a laser detecting set, a control system and an alarm, wherein the conveying mechanism is used for conveying liquid crystal glass; the guide wheels are correspondingly arranged at two side edges of the conveying mechanism and are used for stabilizing and guiding the conveyed liquid crystal glass; each guide wheel is provided with a through hole which is horizontally formed in a lower mounting seat of each guide wheel; the laser detecting set is used for generating a laser beam which passes through the through holes of the at least two guide wheels; the laser detecting set, the conveying mechanism and the alarm are connected to the control system; if the variation value of the cross section area of the laser beam which passes through the through holes is beyond a preset threshold value, the variation information of the cross section area can be detected and sent to the control system through the laser detecting set; the control system can be used for handling the variation information, controlling the conveying mechanism to stop running according to the handled variation information, and controlling the alarm to alarm.