A sole nail comprises an assembly post having a plurality of rubber claws; the assembly post having a via hole forming an upper and a lower opening in the assembly post; a part of the assembly post having thread; an elastomer enclosing an periphery of the assembly post having thread; a steel nail passing through the via hole of the assembly post; an upper end of the elastomer resisting against a bottom of the steel nail; a seat having a screw hole penetrating through the seat; the seat being engaged into a lower sole of shoe; and a waterproof pad made of soft rubber; a bottom of the waterproof pad corresponding the steel nail being formed with a groove; and an upper sole covering upon the waterproof pad.