Sewing machine

The invention provides a sewing machine. The sewing machine comprises a machine shell, a main shaft, an eccentric wheel connecting rod and a presser foot assembly, the main shaft is rotatably arranged in the machine shell, and the eccentric wheel connecting rod is arranged on the main shaft in a sleeving mode and eccentrically arranged relative to a center shaft of the main shaft; the presser foot assembly comprises a connecting structure, an inner presser foot and an outer presser foot, and the inner presser foot and the outer presser foot are both connected with the connecting structure so as to drive the inner presser foot and the outer presser foot to alternately ascend and descend through the connecting structure; the sewing machine further comprises a driving device; the first crank structure is connected with the connecting structure and drives the connecting structure to move, the first crank structure is provided with a sliding groove, the driving end of the driving device is connected with the eccen