The invention provides an automatic steel roll packaging device which comprises a material transporting trolley, a lifting mechanism, a side pressing unit and a core penetrating pressing unit. The upper end of the material transporting trolley is rotationally connected with two material rotating rollers. Rolling shafts of the two material rotating rollers are in chain transmission. The roller shaft of one material rotating roller is in chain transmission with a motor shaft of a motor. The lifting mechanism is rotationally connected with a paper pressing roller. The two ends of the paper pressing roller are rotationally connected with paper pressing frames. The longitudinal section of each paper pressing frame is in a shape like the Arabic number '7', and the end portion of each paper pressing frame is fixedly connected to the front wall of the lifting mechanism. The side pressing unit comprises side pressing rollers which are in left-right symmetry about the center line of the lifting mechanism, and the axial direction of the side pressing rollers is the vertical direction. The core penetrating pressing unit comprises two core penetrating pressing rollers which are in left-right symmetry about the center line of the lifting mechanism, and the two core penetrating rollers reciprocate at the same time in the vertical direction. According to the automatic steel roll packaging device, it is ensured that a packaging material can be attached to the outer circular side wall, the two end portions and the inner circular side wall of a roll completely; and packaging materials are saved, the packaging time is also shortened, and the working efficiency is improved.