Positive pressure type pickle jar cover

The utility model discloses a positive pressure type pickle jar cover which comprises a cover body, a chemical reaction cup, a non-woven fabric bag and a magnetic adsorption device, and the lower end of the cover body is open and arranged above a pickle jar body. The upper end of the chemical reaction cup is detachably connected to the upper end of the inner side of the cover body, multiple exhaust holes are formed in the upper portion of the side wall of the chemical reaction cup, and the chemical reaction cup is used for storing reactants A; the non-woven fabric bag is used for storing a reactant B, and the reactant A can react with the reactant B to generate carbon dioxide; the magnetic adsorption device is used for controlling the reactant B in the non-woven fabric bag to be separated from and contacted with the reactant A in the chemical reaction cup. According to the positive pressure type pickle jar cover provided by the utility model, the speed of forming an oxygen-free environment in the pickle jar b