The invention discloses a sun-shading product testing device, which comprises a black box body and a white box body. A tested object is arranged on one side of the white box body between the two box bodies, and is connected with the black box body by a fixture; the other side of the black box body is connected with an observation box; observation holes are formed between the observation box and the black box body; the black box body and the observation box are non-light tight; the upper ends of the black box body and the observation box are provided with an illuminating lamp respectively; a white wall body used for reflecting light onto the tested object is arranged opposite to the white box body. The sun-shading product testing device has the characteristics of suitability for various fabric-like sun-shading materials, simple equipment structure, simplicity and convenience of operation and durability.