The invention discloses a color matching method and system of plant growth lamps. After the plant growth lamps are numbered in sequence, preset dimming signals are provided for driving signals of theplant growth lamps so that the plant growth lamps can emit light sources according to different red-blue spectral intensity ratios; growth state data of plants corresponding to different plant growthlamps is collected, the data and the serial numbers of the plant growth lamps are sent to an intelligent terminal, the intelligent terminal collects the data and the serial numbers and conducts calculation, then the red-blue spectral intensity ratios of the plant growth lamps under the best growth state are obtained, and finally the red-blue spectral intensity ratios of the plant growth lamps areuniformly set as optimum values. The color matching method is high in automation degree, can automatically complete the detection and calculation process, and is high in calculation efficiency and speed, the optimum spectral ratios of the plant growth period can be traced and determined in the full process, the intelligent terminal can adopt a common intelligent mobile phone or a computer and is easy to operate and high in working efficiency, manual data processing is not needed, labor is saved, and the planting cultivation cost is lowered.