Negative-pressure feeding dust-return-prevention device of reaction kettle

The utility model discloses a negative-pressure feeding dust-return-prevention device of a reaction kettle. The negative-pressure feeding dust-return-prevention device comprises a reaction kettle body, wherein the reaction kettle body is provided with an upper cover; a cylindrical dust capturer is arranged on the upper cover; a filtering component is arranged in the dust capturer; the axial upper end of the dust capturer is connected with a high-pressure draft fan through a high-pressure air tube; the filtering component comprises a mounting plate, a plurality of cylindrical cage-shaped filtering bag brackets and filtering bags of which the number is equal to that of the filtering bag brackets; the mounting plate is clamped and fixed between the upper end cover and the dust capturer; the axial ends of the filtering bag brackets are all fixedly mounted on the mounting plate; air passing holes are formed in the positions, corresponding to the axial ends of the filtering bag brackets, in the filtering bag mounting plate; the filtering bags respectively sleeve filtering bag brackets in a one-to-one correspondence manner; one high-pressure pulse air tube is coaxially inserted into the center of each filtering bag bracket.