Escape prevention device in fry rearing process

The utility model relates to the technical field of fry rearing, in particular to an anti-escape device in the fry rearing process, which comprises a retaining frame, a top plate and a rearing box, the retaining frame is arranged on the inner side of the rearing box, the top plate is attached to the upper end of the rearing box and fixedly connected to the upper end of the retaining frame, a sliding groove is arranged on the inner side of the retaining frame, and an inner plate is slidably connected to the inner side of the sliding groove on the retaining frame. Second driving blocks are fixedly connected to the front side and the rear side of the upper end of the inner plate, the second driving blocks slide on the front side and the rear side of the upper end of the blocking frame, the second driving blocks are connected into the bottom side of the top plate in a sliding mode, and lead screws penetrate through the second driving blocks. And meanwhile, a sponge mat and a sponge ring are matched for protection