A device for automatically lifting a cover of a mobile phone by pressing is to control the lifting/closing operation of an upper cover relative to a main body of a mobile phone. A housing member is connected between the main body and the upper cover. The device for lifting the cover comprises a pressing-and-controlling means provided within the housing member, a braking means accommodated within the pressing-and-controlling means and movably connected to the pressing-and-controlling means, a rotating means operatively connected to the pressing-and-controlling means and the braking means, and a reciprocating means operatively connected to the other end of the rotating means. With the above arrangement, a user can operate the pressing-and-controlling means with single hand to drivingly connect to the braking means and cause the rotating means to rotate and slide, thereby to automatically lift the upper cover of the mobile phone after being pressed. Alternatively, the user can operate the reciprocating means and the rotating means to cause them to rotate and slide so as to manually open/close the upper cover. Therefore, it is convenient for the user to answer a call.