The invention relates to a mobile phone shell and especially relates to a mobile phone shell possessing high temperature alarm and cooling functions. The mobile phone shell comprises a shell and an alarm lamp installed on a side edge of the shell. The shell comprises a first anti-oxidation layer, a silver heat conduction layer, a second anti-oxidation layer and a protective layer which are successively overlaid and arranged from inside to outside. The silver heat conduction layer is provided with a temperature-sensitive sensor. The temperature-sensitive sensor is electrically connected to the alarm lamp. The shell is provided with a cooling fan. A rotary impeller of the cooling fan is arranged towards a shell surface. The temperature-sensitive sensor is used to sense heat of a back portion of a mobile phone and carries out alarm. The cooling fan is used to accelerate emission of the heat of the mobile phone so as to solve a problem that heat dissipation of an existing mobile phone is slow.