The utility model provides a push plate mechanism of a sewing machine, and belongs to the technical field of sewing machines. The problem that in the prior art, a push plate mechanism is inconvenient to assemble and disassemble is solved. The sewing machine comprises a bottom plate and a machine head, wherein a sliding groove is formed in the bottom plate, and the machine head is arranged on the upper portion of the bottom plate. The push plate mechanism comprises a long-strip-shaped needle plate, a left push plate and a right push plate, wherein the long-strip-shaped needle plate is arranged inside the sliding groove and located below the sewing machine head, and the left push plate and the right push plate are located on the left side and the right side of the needle plate respectively, and can slide along the sliding groove. The length direction of the needle plate is perpendicular to the sliding direction of the sliding groove, the length of the needle plate is larger than the width of the projection, on the bottom plate, of the sewing machine head, and the width of the sliding groove is matched with the length of the needle plate. The push plate mechanism of the sewing machine facilitates assembling, adjusting and maintaining of the sewing machine.