Casing assemblies and a mobile terminal are provided. A casing assembly includes: a rear casing and a wearproof assembly. The rear casing includes an outer surface and an inner surface opposite the outer surface, and the rear casing defines a mounting hole through the outer surface and the inner surface. The wearproof assembly includes a coupling member and a decorative member. The coupling member is coupled to the rear casing passing through the mounting hole, and defines a recess at a side of the coupling member opposite the inner surface. The decorative member is embedded in the recess. The coupling member and the decorative member protrude from the outer surface.