The invention relates to an LED (Light Emitting Diode) scanning screen blanking method, a device and an LED scanning screen. The method comprises the following steps: detecting a data latch signal for leading the LED screen to drive the data transmission; and discharging parasitic capacitance of each LED when a high-level signal of the data latch signal is detected. In the invention, when the high-level signal of the data latch signal is detected, the parasitic capacitance of each LED is discharged through detecting the data latch signal for leading the LED screen to drive the data transmission; when an output enable signal is at high level, all PMOS (Channel Metal Oxide Semiconductors) are cut off according to the time sequence of an LED screen module data interface; when a data latch signal LE is at high level, the signal enable signal also is at high level so as to ensure that when the parasitic capacitance is discharged under the situation that the data latch signal LE is at the high level, all PMOS are cut off to realize the effect that the parasitic capacitance is discharged under the situation that all the PMOS tubes are cut off, therefore, the conditions of generating the darkness and the brightness are damaged, and the dark and bright phenomena are eliminated.