The invention discloses a protective pad of an anti-cracking safe box. The protective pad comprises a transverse plate and a vertical plate, and the transverse plate and the vertical plate are perpendicular to each other. The protective pad is characterized in that the transverse plate is equally divided into a first transverse plate body and a second transverse plate body; the side, adjacent to the second transverse plate body, of the first transverse plate body is provided with a triangular groove; one side of the bevel edge of the triangular groove is provided with a first arc-shaped groove, and the bevel edge of the triangular groove and one end of the first arc-shaped groove form a first hook; the bevel edge, at the other end of the first arc-shaped groove, of the triangular groove is provided with a second arc-shaped groove; the second arc-shaped groove, the first arc-shaped groove and a section of the bevel edge of the triangular groove form a first cut line; the side, adjacent to the first transverse plate body, of the second transverse plate body is provided with a second cut line perpendicular to the first cut line; the second cut line corresponds to the first cut line, and the transverse plate and the vertical plate are formed by cutting a cardboard; a layer of packaging paper is attached to the surface of the cardboard. The protective pad has the advantages of being simple in structure, convenient to use, convenient to store, low in cost, capable of preventing cracks and the like.