Sewing machine for zigzag sewing

The invention discloses a sewing machine for zigzag sewing and belongs to the technical field of textile equipment. The sewing machine comprises a bottom table and a sewing machine body, the sewing machine body is connected to the top of the bottom table, a containing cavity is formed in the bottom table, an air cylinder is arranged in the containing cavity, and a fixing plate is fixedly arrangedat the output end of the air cylinder; the air cylinder is arranged in the bottom table and pushes the whole support to move front and back, the support is composed of the bottom support, the longitudinal support and the front end support, the support moves front and back, the top of the front end support is in lap joint with the roller at the moment, and therefore the support is pressed down to drive the auxiliary supporting rod to move downwards and forwards. According to the sewing machine, the pressing plate at the front end of the sewing machine body can press cloth on the surface of thesewing platform to move fr