A detachable base, for supporting an object as a flat-panel display comprises a base-plate, a supporting pillar, and a connecting assembly. The base-plate has a positioning block disposed on an upper surface thereof. The positioning block has a fillister. The supporting pillar has an upper end and a lower end, the lower end of the supporting pillar is received in the fillister of the positioning block. The connecting assembly is connected with the object and has an accommodating space for receiving the supporting pillar and the positioning block when the connecting assembly is connected with the base-plate.