The invention belongs to the technical field of greenhouse crop growth information and environment information detection, and particularly discloses a detecting method for greenhouse crop growth information and environment information based on multi-sensor information. The detecting method includes the following steps: utilizing a spectrometer, a multispectral imager and a thermal imager to obtain the spectrums, the multispectral image and the canopy temperature information of the greenhouse crop; utilizing temperature, humidity, irradiance, CO2 density, EC and pH value sensors to obtain the temperature-light-moisture fertilizer environment information of the greenhouse; optimizing the spectrum, the image and the canopy temperature characteristics of the nutrition and moisture of the crop, so as to obtain the characteristic space of NPK nutrition and moisture; extracting the morphological characters of the spectrum and the image of the crop, so as to obtain the leaf area index, the stem diameter, the plant body and the fruit growth rate of the crop; and continuously monitoring and recording and formatting the obtained greenhouse environment information of the nutrition, the water, the growth vigor and the temperature-light-moisture fertilizer of the crop, so as to serve as the comprehensive detecting information of the growth and the environment of the greenhouse crop. The information obtained by means of the method can be used for the liquid manure management and environmental control and regulation according to the actual requirement of the greenhouse crop growth.