The present invention is to provide a fixed base assembly of mobile phone comprising a base, a cylinder extended upward from the center of the top of the base having one end coupled to a connecting rod, and the other end of the connecting rod able to clamp a mobile phone, wherein the bottom of the base is hollow and connected to the inside of the cylinder, such that the base can be slid, expanded, or contracted up and down along the cylinder. In addition, a clicking member is extended from the cylinder and the base, and the pivotal end of the clicking member symmetrically has a circular protruded head section such that when the clicking end of the clicking member is pressed, the head section of the clicking member presses against the surface of the base to lift the sucking disc of the cylinder, and make the bottom of the sucking disc vacuum and attached onto a fixed object.