Touch screen electronic device and soft keyboard starting method thereof

A touch screen electronic device comprises a shell, a first storage module, a second storage module, a touch screen, a first sensor, a second sensor and a processing module, wherein when the first sensor or the second sensor senses that a user touches a first corner or a second corner of the shell, the processing module starts the first storage module or the second storage module to store a soft keyboard, and the information of the soft keyboard is displayed on the touch screen according to preset position data so as to be used for users to input characters. The soft keyboard can be started as long as the user touches the first corner or the second corner of the shell, and characters can be inputted by a single hand of the uses and also can be inputted by two hands of the user, so that convenience in use can be realized. The invention also relates to a soft keyboard starting method.