Device for measuring surface diffuse reflectivity of material

The invention discloses a device for measuring the surface diffuse reflectivity of a material based on an annular photoelectric detector array. The device comprises a collimation light source, a rotating stage, a plurality of photoelectric detectors and signal recording equipment, wherein the plurality of photoelectric detectors are arranged on the body of a circular ring-shaped fixing bracket; the included angle between an initial measurement line and a termination measurement line is 270 degrees; the collimation light source is arranged on the body of the circular ring-shaped fixing bracket; the emergent light exactly faces the center of the circular ring-shaped fixing bracket; the included angle between the emergent light and the initial measurement line is 90 degrees; and the rotating stage is arranged in the middle of the circular ring-shaped fixing bracket and can drive a material to be measured to rotate around the rotating stage by a certain angle. The device has the characteristics of compact structure, high reliability, convenience in use and the like, and does not demand too much on the stability of the light source.