The invention relates to the technical field of semi-solid metal machining equipment, and discloses a conical barrel type semi-solid metal manufacturing device and a use method thereof. The conical barrel type semi-solid metal manufacturing device comprises a storage mechanism and a feeding mechanism, wherein the storage mechanism comprises a first protection shell, a rotating ring, a storage outer cavity and a first discharge port; the rotating ring is welded and connected to the upper end of the first protection shell; the storage outer cavity is formed in the interior of the protection shell; the first discharge port is formed in the lower end of the protection shell; and the feeding mechanism is positioned at the upper end of the material storage mechanism and comprises a second protection shell, an annular pipe, a positioning groove, a feeding pipe, a rotating bottom plate, rotating supports, discharging holes and connecting rods. According to the conical barrel type semi-solid metal manufacturing device and the use method thereof, the feeding mechanism is arranged, raw materials can be uniformly fed into the storage mechanism, and the fed raw materials are effectively prevented from being stacked together; and a transmission mechanism can drive a machining mechanism and the storage mechanism to rotate in opposite directions, the shearing force formed by the device is increased, and thus the use effect of the device is greatly improved.