A metal housing includes a bottom shell and a reinforcement frame. The reinforcement frame is interference fitted with the bottom shell. The display screen is fixed on the reinforcement frame. The bottom shell includes a bottom plate and four side plates extended from a periphery of the bottom plate. A thickness of the bottom shell is below 1.2 mm. The reinforcement frame resists the four side plates of the bottom shell. The reinforcement frame includes four reinforcement walls integrally formed with each other.