The invention provides a multi-purpose eccentric rotating and adjusting ball valve, comprising a split type valve body and upper covers; the upper covers are fixedly connected to one end of the valvebody; the end part, away from the upper covers, of the valve body is provided with a bottom cover plate; the valve body is internally provided with an eccentric hemispherical valve core and one end ofthe valve core is fixedly connected with a valve rod; the valve body corresponds to the valve core to form an eccentric structure; the end part, away from the valve body, of the upper covers is provided with a Ri-shaped fixing frame (Ri, Pinyin of Chinese character); the valve rod extends from the end of the valve rod and is connected with a middle crossbeam of the Ri-shaped fixing frame and a bearing is arranged at a contacting end of the valve rod and the crossbeam; a guide sleeve is arranged between the valve rod and the valve body; lower sealing packing is arranged between the end part ofthe valve core away from the valve rod and the valve body; the valve rod is provided with upper sealing packing between the upper covers; cooling fins are arranged outside the upper covers; and a decompression orifice plate is arranged at the outlet of the valve body. The multi-purpose eccentric rotating and adjusting ball valve provided by the invention is not prone to form sediments and has better anti-blocking performance and high reliability.