LED display screen blind spot detection method and detection device thereof

The invention belongs to the technical field of LED display screen detection, and particularly discloses an LED display screen blind spot detection method and a detection device thereof. The detection method comprises specific steps: after a main sending card acquires synchronous data, synchronous data broadcast packets are sent to all auxiliary sending cards and blind spot detection receiving cards at regular time; each auxiliary sending card and each blind spot detection receiving card receive the synchronous data broadcast packets; the auxiliary sending cards and the blind spot detection receiving cards passively complete a command packet sending process; and after each blind spot detection receiving card receive the command, a different bitmap is selected according to the LED module type and the row number and column number of the display screen to calculate each GPIO port of a display screen interface, color, coordinate and fault information of each pixel point of each GPIO port is then calculated. The d