The present invention discloses an opening structure for a portable device, which comprises a locking hook module and a photography module and is arranged on a cover body of the portable device, wherein the locking hook module at least comprises a hook-shaped body, a carrying body and an elastic body; the photography module at least comprises a housing, a photography lens and a rotating shaft, and a conversion member is connected with the rotating shaft. The hook-shaped body of the locking hook module is arranged on the carrying body, the elastic body is connected with the carrying body and the cover body, the photography lens is arranged inside the housing of the photography module, and the rotating shaft is arranged on the housing. When the rotating shaft is rotated to generate a rotaryforce, the rotary force is converted into a thrust force by a converting member for pushing the locking hook module to displace. Further, a switch arranged on the cover body can be touched. When the cover body is opened, the portable device can be also started.