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This utility model relates to the field of dartboard technology, specifically to a portable foldable dartboard. It features a rotatable connection between one end of each of the fan-shaped plates and the inner wall of each of the support grooves. Folding straps are fixedly connected between adjacent pairs of fan-shaped plates. A fixing plate is bolted to one side of each fan-shaped plate, and a support rod is provided at the bottom of each fixing plate. An adsorption plate is fixedly connected to the bottom end of each support rod. This design achieves a foldable main structure for the dartboard, solving the problems of fixed structure, large size, difficulty in storage, and inconvenience in carrying existing dartboards. When not in use, the dartboard can be folded into a long, thin cylinder, significantly reducing its overall space occupation. This allows users to easily store or carry it in a storage tube, greatly improving the portability and space adaptability of the device.