The invention relates to a mobile phone casing and particularly relates to a mobile phone casing having a detachable selfie stick. The mobile phone casing having the detachable selfie stick comprises a mobile phone protection casing, a selfie stick and a support function device; the selfie stick and the support function device comprise a connection port pedestal, a main rotary shaft, an auxiliary rotary shaft, a double-shaft connection rod and a telescopic rod; the connection port pedestal is in fasten cooperation with the back side of the mobile phone protection housing through a detachable port; the telescopic rod is in hinge connection with the double-shaft connection rod through the main rotary shaft; the double-shaft connection rod is in hinge connection with the connection port pedestal through the auxiliary rotary shaft; the telescopic shaft is contained in the connection port pedestal in a contraction state to realize a folding state in a portable manner; the telescopic rod rotates around the main rotary shaft and realizes a support function by forming an included angle with the mobile phone protection housing; when the telescopic rod is in an extending state, the selfie stick function can be realized through rotation of the main rotary shaft and an auxiliary rotary shaft. The mobile phone casing having the detachable selfie stick perfectly integrates functions of the mobile phone housing, the selfie stick, the mobile phone support and a portable cosmetic mirror, realizes one for multiple purposes and is convenient and practicable.