The invention relates to a scintillator composite board, which comprises a sensor array flat plate layer including a plurality of photosensitive sensors, a scintillator layer laid on the sensor array flat plate layer, and a optical reflecting structure layer which is laid on the scinitllator layer and has non-isotropy reflection characteristics. A plurality of light reflecting units are arranged on the surface of the optical reflecting structure layer, and the number of the light reflecting units is more than or equal to that of the photosensitive units. The scintillator composite board of the invention overcomes the technical problem of the reduction of MTF (Modulation Transfer Function) caused by the scattering of light propagating in a substrate, thus improving the performance of a scintillator.