A terminal device comprising: a shell; an image acquisition module; and a driving module, positioned in the shell and connected with the image acquisition module, the driving module comprising a memory metal; wherein the memory metal has different lengths in an energized state and a deenergized state, and is configured to control the image acquisition module by length extension and contraction to get into and out of the shell; characterized in that: wherein the memory metal comprises a first metal piece (103a1) and a second metal piece (103a2) different from the first metal piece (103a1) in energizing time; wherein the driving module further comprises: a rotating part, connected with the first metal piece (103a1) and the second metal piece (103a2) respectively; wherein the rotating part is driven to rotate clockwise in response to the first metal piece (103a1) being energized and contracting, and the rotating part is driven to rotate counterclockwise in response to the second metal piece (103a2) being energized and contracting; and a first elastic piece, connected with the rotating part and the image acquisition module respectively; wherein a length of the first elastic piece changes along with rotation of the rotating part, and the image acquisition module gets into and out of the shell along with length changing of the first elastic piece; further comprising: a printed circuit board, positioned in the shell and having a through hole; wherein both the rotating part and the first metal piece (103a1) are on a first surface of the printed circuit board, the second metal piece (103a2) is on a second surface of the printed circuit board which is an opposite surface of the first surface, and the second metal piece (103a2) penetrates through the through hole to be connected with the rotating part. a shell; an image acquisition module; and a driving module, positioned in the shell and connected with the image acquisition module, the driving module comprising a memory metal; wherein the memory metal has different lengths in an energized state and a deenergized state, and is configured to control the image acquisition module by length extension and contraction to get into and out of the shell; characterized in that: wherein the memory metal comprises a first metal piece (103a1) and a second metal piece (103a2) different from the first metal piece (103a1) in energizing time; wherein the driving module further comprises: a rotating part, connected with the first metal piece (103a1) and the second metal piece (103a2) respectively; wherein the rotating part is driven to rotate clockwise in response to the first metal piece (103a1) being energized and contracting, and the rotating part is driven to rotate counterclockwise in response to the second metal piece (103a2) being energized and contracting; and a first elastic piece, connected with the rotating part and the image acquisition module respectively; wherein a length of the first elastic piece changes along with rotation of the rotating part, and the image acquisition module gets into and out of the shell along with length changing of the first elastic piece; further comprising: a printed circuit board, positioned in the shell and having a through hole; wherein both the rotating part and the first metal piece (103a1) are on a first surface of the printed circuit board, the second metal piece (103a2) is on a second surface of the printed circuit board which is an opposite surface of the first surface, and the second metal piece (103a2) penetrates through the through hole to be connected with the rotating part. a rotating part, connected with the first metal piece (103a1) and the second metal piece (103a2) respectively; wherein the rotating part is driven to rotate clockwise in response to the first metal piece (103a1) being energized and contracting, and the rotating part is driven to rotate counterclockwise in response to the second metal piece (103a2) being energized and contracting; and a first elastic piece, connected with the rotating part and the image acquisition module respectively; wherein a length of the first elastic piece changes along with rotation of the rotating part, and the image acquisition module gets into and out of the shell along with length changing of the first elastic piece; further comprising: a printed circuit board, positioned in the shell and having a through hole; wherein both the rotating part and the first metal piece (103a1) are on a first surface of the printed circuit board, the second metal piece (103a2) is on a second surface of the printed circuit board which is an opposite surface of the first surface, and the second metal piece (103a2) penetrates through the through hole to be connected with the rotating part.