The utility model discloses a two pneumatic hammer shedder of chain pig moulding machine, the mould passes through the sprocket and drives rotatoryly, the sprocket passes through the bearing frame andinstalls on the pig moulding machine support, there is the aluminium ingot in the mould, the front end fixedly connected with left side pneumatic hammer seat and the right pneumatic hammer seat of pig moulding machine support, the end of a left side pneumatic hammer seat and right pneumatic hammer seat is provided with left ear respectively and climbs and climb with the auris dextra, left side ear is climbed to rotate with left pneumatic hammer through left side axle and is connected, the auris dextra is climbed to rotate with right pneumatic hammer through right side axle and is connected, the top of pig moulding machine support is fixed with a tailstock, the tailstock is connected with left cylinder tailstock and right cylinder tailstock through selling directly to households respectively, the front end of left side cylinder tailstock and right cylinder tailstock is provided with left cylinder and right cylinder respectively, left side cylinder and right cylinder are respectively through selling directly to households and left pneumatic hammer ejector pad and right pneumatic hammer ejector pad swing joint, left side pneumatic hammer ejector pad is separable with left pneumatic hammer, right side pneumatic hammer ejector pad is separable with right pneumatic hammer. The utility model discloses not only increased striking force and cycle and improved drawing of patterns rate,still improved the mould and scraped the condition of hanging.