The invention discloses a multi-spectral measurement type light resource monitoring method and system. The multi-spectral measurement type light resource monitoring method comprises implementing the measurement of the irradiance of the solar radiation in the multi-spectral range through a plurality of channels and combining an indium, gallium and arsenic pin photoelectric detector of a broadband and a light filter with a silicon photodiode detector to implement the multi-spectral light resource monitoring based on measurement data of the irradiance of the solar radiation in the multi-spectral range. According to the multi-spectral measurement type light resource monitoring method and system, the defects that the equipment types are less, the applicable range is small, the measurement accuracy is low, and the like in the prior art can be overcome so as to implement the more equipment types, large applicable range and high measurement accuracy.