The utility model discloses a pneumatic cylinder is changed to jaw breaker bracket, change hydraulic cylinder including moving jaw, bracket, frame back wall and bracket, frame back wall and moving isinstalled the bracket and is changed hydraulic cylinder between the jaw, the frame back wall with move the jaw bottom and be equipped with the bracket, move the jaw through the pneumatic cylinder jacking, quick convenient change bracket when changing the bracket, only needs started hydraulic oil cylinder, when the pneumatic cylinder extends at every turn for moving the jaw and keeping away from the bracket, put new bracket to target damage or the bracket of wearing and tearing is taken away this moment, then the pneumatic cylinder returns and contract, make move the jaw again with the bracketcontact, the completion is changed to the bracket. Degree of difficulty greatly reduced is changed to the bracket, reduces the device structure time, the improve equipment utilization ratio.