Printing-down device for offset printing

The invention discloses a printing-down device for offset printing, and relates to the technical field of photographic plate making equipment, and the printing-down device comprises a defoaming mechanism which is arranged at the upper position of the inner side surface of a device body and is used for clamping the edge of a photosensitive plate, and then the defoaming mechanism pushes the photosensitive plate to slide downwards to be close to the surface of an original plate. According to the plate burning device for offset printing, a sliding cylinder moves downwards on the inner side face of a sliding rail, a photosensitive plate is driven to be close to an original plate, a clamping assembly and the bottom of a matching plate make preferential contact with and are tightly attached to the top of a residue preventing mechanism, a damping roller is manually rotated, a pressing and covering assembly is rotated to the position over the photosensitive plate, and the photosensitive plate is burnt. The two pressin