The invention discloses a flip-open cover mechanism used on an electronic device, which comprises a first part and a second part, wherein the second part is movably connected with the first part and can be turned and covered on the first part, the flip-open cover mechanism further comprises an elastic guide mechanism, the fist end of the elastic guide mechanism is connected with a first side part of the first part, the second end is connected with a second side part of the second part, and the first side part and the second side part are positioned on the same side. The elastic guide mechanism comprises a sleeve, an elastic element and a guide pillar. The first end of the elastic guide mechanism is formed at one end of the sleeve, and an opening is formed at the other end; the elastic element is sheathed in the sleeve through the opening; and the second end of the elastic guide mechanism is formed at one end of the guide pillar, the other end is connected with the elastic element, and the guide pillar moves relative to the sleeve under the action of the elastic element. The utilization of the structure can spread the flip-open cover mechanism by 180 degrees and provide a broader visual angle; furthermore, the elastic guide mechanism is arranged at the side part of the flip-open cover mechanism, thereby not occupying the area of buttons of a mobile phone and leading the length after covering the cover to be shorter than a bar phone.