The invention discloses an adjustable-angle high-efficiency steel strip unreeling machine which comprises a base. A through hole is formed in the top of the base, an adjusting device is fixedly mounted at the bottom of an inner cavity of the base, clamping devices positioned on two sides of the inner cavity of the base are fixedly mounted above the adjusting device, side faces of the two clamping devices are slidably connected through a sliding device, the bottom of the sliding device is fixedly connected with the top of the adjusting device, one side of the sliding device far away from the adjusting device is fixedly connected with a through hole and extends to a lifting column outside the base, and one end of the lifting column far away from the sliding device is fixedly connected with a fixing table. By the aid of the adjusting device, the sliding device and the lifting column, an uplifting column can push the lifting column to synchronously rise and fall through a push plate in rising and falling movement, and unreeling angles can be automatically adjusted when the fixing table connected with the lifting column stably rises and falls.