A protective case for a mobile terminal, the mobile terminal comprising a middle frame and a slider slidable relative to the middle frame; the protective case comprising: a body portion having a periphery (211, 212) comprising: a first straight edge; a second straight edge opposite to the first straight edge; and a top edge connected between the first straight edge and the second straight edge; and a rim portion fixed to the periphery (211, 212) of the body portion, wherein the rim portion is connected to the first straight edge and the second straight edge, and disconnected to the top edge; the rim portion comprises: an internal surface facing towards the body portion; an external surface opposite to the internal surface; and a top end surface, connected to the internal surface and located at one end of the rim portion that is close to the top edge; wherein a sliding groove is defined in the rim portion; characterized in that a length of the sliding groove is less than a length of the rim portion, the sliding groove is recessed from the internal surface in a direction towards the external surface, and further extends to the top end surface; wherein, when the protective case is sleeved at the outer side of the mobile terminal, the slider is capable of extending or retracting relative to the top edge without contacting the rim portion. a body portion having a periphery (211, 212) comprising: a first straight edge; a second straight edge opposite to the first straight edge; and a top edge connected between the first straight edge and the second straight edge; and a first straight edge; a second straight edge opposite to the first straight edge; and a top edge connected between the first straight edge and the second straight edge; and a rim portion fixed to the periphery (211, 212) of the body portion, wherein the rim portion is connected to the first straight edge and the second straight edge, and disconnected to the top edge; the rim portion comprises: an internal surface facing towards the body portion; an external surface opposite to the internal surface; and a top end surface, connected to the internal surface and located at one end of the rim portion that is close to the top edge; wherein a sliding groove is defined in the rim portion; characterized in that a length of the sliding groove is less than a length of the rim portion, the sliding groove is recessed from the internal surface in a direction towards the external surface, and further extends to the top end surface; wherein, when the protective case is sleeved at the outer side of the mobile terminal, the slider is capable of extending or retracting relative to the top edge without contacting the rim portion. an internal surface facing towards the body portion; an external surface opposite to the internal surface; and a top end surface, connected to the internal surface and located at one end of the rim portion that is close to the top edge; wherein a sliding groove is defined in the rim portion; characterized in that a length of the sliding groove is less than a length of the rim portion, the sliding groove is recessed from the internal surface in a direction towards the external surface, and further extends to the top end surface; wherein, when the protective case is sleeved at the outer side of the mobile terminal, the slider is capable of extending or retracting relative to the top edge without contacting the rim portion.