The invention relates to a protective device for a digital X-ray imaging plate, which is characterized by comprising the imaging plate, a front metal cover, a rear metal cover, wherein the front metal cover and the rear metal cover are located on two faces of the imaging plate and are connected through locking bolts. The lead block shielding cover is arranged at the front metal cover, top blocks located at two ends of the imaging plate and used for fixing the lead blocks, fixing plates for fixing the lead blocks and fixing bolts for connecting the fixing plates and the imaging plate. Each lead block located in the middle of the imaging plate is of a structure with one face provided with a slide groove and the other face provided with an embedded pin. The protective device for the digital X-ray imaging plate has the advantages that an imaging plate protective cover prevents damage of flashover of power devices to the imaging plate, reduces damage of perpendicular incidence of X-ray to the imaging plate, and prolongs service life of the digital imaging plate.