A swing-type cover opening and closing device for a mobile phone according to an exemplary embodiment of the invention includes: i) a main body case that is disposed in a main body of the mobile phone and has a through-hole formed at one side thereof; ii) a cover case that is disposed in a cover of the mobile phone, has a hollow shaft penetrating the through-hole integrally projecting thereon, and is pivotably mounted on the main body case; and iii) an elastic unit of which both ends are pivotably joined to the main body case and the cover case, respectively, to provide elastic force to the cover case by rotation of the cover case, wherein the elastic unit includes a housing that is pivotably connected to the main body case through a first hinge pin, a slide member that is joined to the inside of the housing to be slidable and lockable, and is connected to the cover case through a second hinge pin, and a plurality of spring members that are installed in the housing and apply elastic force to the slide member.