The invention belongs to the field of glass quality detection, and particularly relates to a cell phone cover plate glass quality detection device. The device comprises a laser light source, a laser alignment module, an interference fringe collection module and a data processing module are arranged at the rear end of the laser light source in sequence, laser emitted by the laser light source is aligned by the laser alignment module, emitted to a to-be-detected sample, reflected by the upper surface and the lower surface of the to-be-detected sample and then emitted into the interference fringecollection module which transmits collected data information to the data processing module, and the data processing module analyzes and processes the data information transmitted by the interferencefringe collection module. Accordingly, by means of the principle of plane light wave interference, the laser emitted by the laser light source is aligned by the laser alignment module and then becomesparallel light, light energy loss can be reduced, the detection precision is improved, the light can be integrated into other assembly line operation environments conveniently to achieve online synchronous measurement, the work efficiency is improved, and a wide application prospect is achieved.