The patent abstract shows a device and method for measuring the yin and yang color of an LED display unit (20), wherein the yin and yang color measurement device of the LED display unit (20) includes a first light collector (11) and a second light collector (12); the first light collector (11) and the second light collector (12) are respectively located on both sides of the light exit surface of the LED display unit (20); the LED in the LED display unit (20) The emitted light is converted into a first photoelectric signal after being irradiated on the first light collector (11); the light emitted by the LED in the LED display unit (20) is converted into a second photoelectric signal after being irradiated on the second light collector (12); the brightness difference of the LED display unit (20) is determined according to the coincidence degree of the first photoelectric signal and the second photoelectric signal. The LED lamp beads of the LED display unit (20) emit light and then illuminate the two light collectors (10).The light irradiated on the two light collectors (10) is converted into a first photoelectric signal and a second photoelectric signal respectively. By comparing the two photoelectric signals, the yin and yang color conditions of the LED display unit (20) can be determined.
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