The invention relates to the technical field of mobile phone devices, and discloses a mobile phone rear shell and a mobile phone. The mobile phone rear shell comprises a heat absorbing layer arrangedtoward the interior of the mobile phone, a heat dissipation layer is arranged on one side of the heat absorbing layer away from the interior of the mobile phone, and radiation particles for transferring the heat transferred from the heat absorbing layer into the heat dissipation layer to the outside in the form of infrared radiation are arranged in the heat dissipation layer. In the mobile phone rear shell, the heat absorbing layer absorbs the heat generated by the mobile phone during use, and the heat is transferred into the heat dissipation layer by the heat absorbing layer, the radiation particles in the heat dissipation layer transfers the heat in the heat dissipation layer to the outside in the form of the infrared radiation so as to reduce the temperature of the heat dissipation layer and to improve the efficiency of the mobile phone rear shell to transfer the heat generated by the mobile phone to the outside, thereby improving the efficiency of heat dissipation of the mobile phone and reducing the temperature of the mobile phone, in this way, the service life of the mobile phone is prolonged, and the mobile phone rear shell has a simple structure, a simple preparation process and a low cost.