A mobile terminal, comprising: a terminal device, comprising a display screen, a first power supply module, and a first wireless communication module, wherein the first power supply module is configured to supply power to the display screen and the first wireless communication module, the terminal device defines a mounting recess on the side thereof facing away from a display area of the display screen, the terminal device comprises a rear wall and a middle plate, and the middle plate is positioned between the display screen and the rear wall; an image capturing device, comprising a casing, a camera module, a second power supply module, and a second wireless communication module, wherein the second power supply module is configured to supply power to the camera module and the second wireless communication module, the camera module and the second power supply module are disposed in the casing, the camera module has a light incident surface exposed from the casing; the image capturing device is configured to be mounted in the mounting recess, thereby making the light incident surface be exposed on the side facing away from the display area; the casing is provided with an engaging slot; and a locking mechanism, comprising a resisting member and a bolt, wherein the resisting member is rotatably connected to the terminal device by rotatably connected to the middle plate, and abuts against the bolt; when the image capturing device is mounted in the mounting recess, the resisting member is rotatable relative to the terminal device thereby driving the bolt to move to a first position and a second position, the bolt is engaged with the engaging slot and the image capturing device is locked to the terminal device when the bolt is at the first position, the bolt exits from the engaging slot and the image capturing device is detachable from the mounting recess when the bolt is at the second position; the second wireless communication module is communicatively connected with the first wireless communication module after the image capturing device being detached from the mounting recess; characterized in that the bolt is slidably coupled with the middle plate, the middle plate is provided with a sliding groove, and the bolt engages with the sliding groove. a terminal device, comprising a display screen, a first power supply module, and a first wireless communication module, wherein the first power supply module is configured to supply power to the display screen and the first wireless communication module, the terminal device defines a mounting recess on the side thereof facing away from a display area of the display screen, the terminal device comprises a rear wall and a middle plate, and the middle plate is positioned between the display screen and the rear wall; an image capturing device, comprising a casing, a camera module, a second power supply module, and a second wireless communication module, wherein the second power supply module is configured to supply power to the camera module and the second wireless communication module, the camera module and the second power supply module are disposed in the casing, the camera module has a light incident surface exposed from the casing; the image capturing device is configured to be mounted in the mounting recess, thereby making the light incident surface be exposed on the side facing away from the display area; the casing is provided with an engaging slot; and a locking mechanism, comprising a resisting member and a bolt, wherein the resisting member is rotatably connected to the terminal device by rotatably connected to the middle plate, and abuts against the bolt; when the image capturing device is mounted in the mounting recess, the resisting member is rotatable relative to the terminal device thereby driving the bolt to move to a first position and a second position, the bolt is engaged with the engaging slot and the image capturing device is locked to the terminal device when the bolt is at the first position, the bolt exits from the engaging slot and the image capturing device is detachable from the mounting recess when the bolt is at the second position; the second wireless communication module is communicatively connected with the first wireless communication module after the image capturing device being detached from the mounting recess; characterized in that the bolt is slidably coupled with the middle plate, the middle plate is provided with a sliding groove, and the bolt engages with the sliding groove.