A mounting mechanism for mounting a touch screen to a housing includes a positioning module, a cover and a press module. The positioning module includes a base board and a positioning portion used to position the housing. The cover is hinged to the base board. The press module includes a first pressing board, a positioning stand used to position the touch screen and first elastic elements clamped between the cover and the first pressing board. The cover defines a through hole with a slidably mounted positioning stand. When the cover is rotated to resist against the base board, the touch screen is positioned opposite to the housing on the positioning portion, the first elastic elements are compressed until the screen is mounted on the housing by a pressing force provided on the first pressing board.