The utility model relates to a tricot machine machinery technical field discloses a piezoelectricity merchant card drive circuit board -fixing device, include: first connecting plate and second connecting plate, first connecting plate and second connecting plate integrated into one piece, and mutually perpendicular, be equipped with two at least screws on the first connecting plate, be formed withthe bulge in two connecting plate intersecting line directions on the second connecting plate edge, be formed with the U -shaped fork on the bulge, the axis of U -shaped fork with the intersecting line is parallel. The utility model discloses a tricot machine drive case is still disclosed, include: the box, install piezoelectricity merchant's card drive circuit board and foretell piezoelectricitymerchant card drive circuit board -fixing device in the box. The utility model discloses a piezoelectricity merchant card drive circuit board -fixing device goes into business card drive circuit board with piezoelectricity and fixes on tricot machine drive case box, and is even as an organic whole with the box, has avoided because box vibration piezoelectricity merchant card drive circuit board is not hard up, the circumstances about coming off even.