The present invention, radiant imaging solid detector, belongs to the field of radiodetection technology. The solid detector includes scintillating crystal and coupled photodiode held in some casing. The casing includes outer shell and lower cover with lightproof and moistureproof paint painted in the sealing part, and has rubber pad for fixing the scintillating crystal inside the casing and fixing and leading out the photodiode poles. Compared with available technology, the present invention has the features of being lightproof and moistureproof, simple structure, etc. When used, several solid detectors may constitute detector array capable of eliminating cross-talk of flash, strengthening electromagnetic antijamming capacity and raising imaging definition.