The invention discloses a multi-spectral skin color calibration and power consumption optimization device based on a PPG technology. The device comprises a detection device body, the detection devicebody comprises an LED, a PD and a processor, the LED and the PD are disposed on the same side, facing a target to be detected, of the detection device body, the processor is sequentially in controlling connection with the LED through an LED timing controller and an LED driver, and the PD is sequentially in communication connection with the processor through a transconductance amplifier, a band pass filter and an analog-to-digital converter; compared with a traditional method, a working method of the device achieves two major purposes that one, two-color light is used for calibrating skin colors, light with a longer wavelength such as infrared light is used for overcoming the problem that dark skin cannot be collected smoothly, so that the device adapts to more user groups, and user feelings are significantly improved; two, a method of dynamically adjusting PPG detection parameters is proposed, so that a working response state is entered at the fastest speed, the data is collected by using the best performance-to-power ratio, and the capability of prolonging runtime of a detection device is significantly improved.