Purification and extraction device capable of automatically adding auxiliary materials and used for petroleum processing

The utility model relates to the technical field of petroleum processing, and discloses a purification and extraction device capable of automatically adding auxiliary materials for petroleum processing, which comprises a reaction kettle and a feeding cover movably mounted at the upper end of the reaction kettle, a temporary storage bin is arranged in the middle of the reaction kettle and the feeding cover, and a feeding cavity is fixedly mounted at one end of a material passing hose. A lifting rod is arranged in the feeding cavity, a rotating plate is arranged at the lower end of the lifting rod, one end of the rotating plate is connected with a floating ball, a temporary storage bin is arranged at the upper end of the reaction kettle, if raw materials in the temporary storage bin are reduced, the floating ball descends, then the rotating plate rotates, the lifting rod descends, and the material stopping block is separated from the feeding cavity; and then the petroleum raw material liquid in the material pas