The present invention relates to a mobile terminal, and in particular to a mobile power bank and a combined terminal device formed by splicing the mobile power bank and the mobile terminal. The mobile power bank comprises a display screen, a storage battery located below the display screen, and a casing for holding the display screen and the storage battery. The mobile power bank is generally flat-plate shaped with a front surface and a back surface. Both an area of a display region of the display screen and an area of an occupied region of the storage battery are not less than 70% of the front surface area. A volume of the storage battery can be increased without changing the thickness of the storage battery, providing an extended charging service for mobile phones. In addition, the mobile power bank of the present invention has a large display screen, when the mobile power bank is connected to a mobile terminal, such as a mobile phone, the display screen and a display screen of the mobile terminal may perform display at the same time.