The utility model provides a sewing machine's upper and lower synchronization and differential feeding device belongs to sewing machine technical field. It has solved the problem that current sewing machine can only realize gauge needle's upper and lower synchronization regulation. This sewing machine includes the upper shaft, go up pay -off axle and lower feeding shaft, the upper shaft passes through crank link mechanism and links to each other with lower feeding shaft, oscillating plate seat is drawn together to synchronization and differential feeding machine from top to bottom, oscillating plate seat links to each other with crank link mechanism, the inner of regulating spindle links firmly with oscillating plate seat mutually down, the gauge needle knob can drive and raise the nodal axisn rotation, gauge needle adjusts the poor top of tooth and links firmly on last regulating spindle, bottom axial positioning has the slider, the both ends of connecting rod link to each other with upper shaft and transmission shaft respectively, the last connecting strip that has linked firmly of transmission shaft, the embedding of slider part is in the arc wall of connecting strip one side, the one end that goes up feeding connecting rod links firmly with the slider mutually, the other end links to each other with last pay -off axle. This sewing machine can realize gauge needle's upper and lower synchronization regulation, can realize gauge needle's upper and lower differential adjustment again.