The diesel jaw crusher drives the pulley and flywheel to move the eccentric shaft through the diesel engine, driving the movable jaw plate to do periodic reciprocating motion, forming an extrusion crushing chamber with the fixed jaw plate. After the material enters from the feeding mouth, it is squeezed and crushed when the movable jaw plate approaches the fixed jaw plate. The material falls during separation, and this cycle continues until it reaches the required particle size and is discharged from the output mouth.