Immunochromatographic detection device

The invention relates to the technical field of immunoassay, and particularly discloses an immunochromatographic detection device including a test strip and a detection device; the test strip includes a multilayer porous membrane and a support sheet; the support sheet is a material having less than or equal to 10% of light transmittance at the wavelength of less than 450 nm and having more than or equal to 90% of light transmittance at the wavelength of more than or equal to 500 nm; the detection device includes an excitation light source, a detection zone for placing the test strip and a light detector; the excitation light source and the light detector are respectively located at both sides of the detection zone. With adopting of a transmission method, the light detector can capture fluorescent signals of the surface and the interior of the multilayer porous membrane, and the detection result is more accurate.