Material feeding system and feeding buffer tank thereof

The utility model discloses a feeding buffer tank. The feeding buffer tank comprises a tank body and an ejecting system arranged in the tank body, and further comprises a screw ejecting device which is arranged at the bottom of the ejecting system and extends to an outlet of the tank body. In the feeding buffer tank provided by the utility model, the screw ejecting device extending to the outlet of the tank body is arranged at the bottom of the ejecting system. The screw ejecting device has the pushing effect, so that raw materials crowded at the outlet can be pushed out of the outlet through the rotation of the screw ejecting device at the outlet when the outlet of the tank body is blocked by the raw materials containing powdered raw materials with dense texture, poor slipping performance and inclination of conglomeration. The feeding buffer tank overcomes the defect of high possibility of material blockade; and the material blockade is avoided, so that the cone part of a raw material tank is not needed to b