The utility model provides a built -in driven jaw breaker belongs to mining and uses the rubbing crusher field. This breaker includes frame, drive assembly, quiet jaw subassembly, moves jaw subassembly, hydraulic pressure adjusting part and the adjustable bracket of quiet jaw, move the jaw subassembly and quiet jaw subassembly is all installed in the frame, moves jaw subassembly and quiet jaw subassembly and constitute the broken chamber that the bottom was equipped with the bin outlet, drive assembly installs at the top of frame, and drive assembly moves the swing of jaw subassembly, the output and the adjustable bracket connection of quiet jaw of hydraulic pressure adjusting part, the adjustable bracket of quiet jaw is connected in order to drive the bin outlet size that the relative frame of quiet jaw subassembly was moved and is changed broken chamber with quiet jaw subassembly. The utility model discloses a hydraulic pressure adjusting part makes the bottom of quiet jaw subassembly move the motion of jaw subassembly relatively, reaches the purpose of the bin outlet size in the broken chamber of adjustment, have easy operation, operating efficiency is high, and reduces intensity of labour's advantage, transmission increase adjusting part adjustment belt tensioning power is in order to increase transmission efficiency.