A mobile base for a luggage case includes a base and two supports. The base includes two aligned sleeves. Each of the sleeves has an inner threaded hole at a central portion thereof. The two supports are movably connected to the sleeves. Each of the supports has a cylinder and an outer threaded section. The outer threaded section is adapted to engage with the inner threaded hole. Thereby, the mobile base of the present invention is suitable for various luggage cases, providing an easy and convenient adjustment.