Double-rod type presser foot driving structure of sewing machine

The utility model relates to a double-rod type presser foot driving structure of a sewing machine, which comprises a cam crank connected with a main shaft of the sewing machine, a transmission crank shaft connected with the cam crank, a transmission group connected with a presser foot and a driving assembly, and the transmission group comprises a lifting control crank shaft, a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is rotationally connected with the presser foot through the second connecting rod, the other end of the first connecting rod is rotationally connected with the lifting control crankshaft, the two ends of the third connecting rod are rotationally connected with the transmission crankshaft and the first connecting rod respectively, and the driving assembly is used for controlling rotation of the lifting control crankshaft and is an extension crank. One end of the extension crank is rotationally connected with the lifting control c