Colorimeter for measuring concentration of monochromatic solution

The invention provides a colorimeter for measuring the concentration of a monochromatic solution. The colorimeter comprises a sample bearing part, a light emitting assembly, an image acquisition assembly, a camera obscura, and a colorimetric module. The image acquisition assembly is used for acquiring a color image of the to-be-detected sample under the light irradiation of the light-emitting assembly, so that the colorimetric module can be used for colorimetrically determining the concentration. The color depth characterization value of the color image is extracted by collecting the color image of the to-be-detected sample, and the concentration of the to-be-detected sample is obtained according to the relational expression between the color depth characterization value and the solution concentration, so that the method is simple to operate, can be applied to measurement of concentrations of various different types of monochromatic solutions, and is wide in application range. A plurality of to-be-detected sa