A detachable base includes a pedestal, a counterweight box mounted on the pedestal, and a shell detachably covered on the counterweight box and the pedestal. The shell includes an edge, a corner having a smooth transition camber surface, and a cover. The edge is detachably connected to the cover. A side edge vertical to the corner is provided with a first fitting portion of a fastening part. A vertical side edge of the edge corresponding to the corner is provided with a second fitting portion of a fastened part. The first fitting portion fits with the second fitting portion through socketing. The counterweight box, the detachable shell and the pedestal of the invention allow the whole detachable base to be disassembled into small-sized parts easy to take and pack, or to be assembled, as spare parts, together with other accessories of the sunshade.