Toughened glass stress spot on-line detection device and detection method

The invention discloses a tempered glass stress spot on-line detection device and method. The tempered glass stress spot on-line detection device comprises a light source module, an imaging module, a control module and an image display module. The imaging module is electrically connected with the control module; the image display module is electrically connected with the imaging module; the light source module is used for emitting polarized light, and the polarized light emitted by the light source module enters the tempered glass from the direction parallel to the thickness of the tempered glass; the imaging module can perform scanning imaging on the tempered glass by using polarized light penetrating through the tempered glass; the control module is used for controlling the scanning imaging frequency and time period of the imaging module on the tempered glass; the image display module is used for displaying the image received from the imaging module; the detection device can detect tempered glass on a produ