Sewing machine anti-wrinkle device, including anti-wrinkle teeth and anti-wrinkle needle board. The anti-wrinkle needle board is provided with a needle board tongue hole on the right side of the needle hole of the common needle board and the feeding tooth hole, and a flexible needle board tongue hole which can extend from the needle board tongue hole is fixed below the needle board. The utility model can press the joint material from the other side of the joint material, make the joint material tighten and flatten, and eliminate the defects of wrinkling and split-layer of the joint material.