The invention relates to a knitting triangle link gear which includes an installation seat transmission fork and a knitting triangle, the transmission fork is hinged on the installing seat, two ends connect with a knitting triangle A and a knitting triangle B respectively, also includes a cam and a motor, a circle side and an end surface of the cam are equipped with a curved surface cam groove and a plane cam groove, the cam connects with an output shaft of the motor and locates on one side of the knitting triangle B, the knitting triangle B is inserted in the curved surface cam groove of thecam through a pin set on the knitting triangle B for driving joint, the knitting triangle C is inserted in the plane cam groove of the cam through a pin set on the knitting triangle C for driving joint, when the cam runs, the cam pushes corresponding knitting triangle moving through the curved surface cam groove and the plane cam groove respectively. The knitting triangle link gear has advantagesthat the knitting triangle link gear has fewer accessory, simple structure, low cost, succinct drive line and high reliability for moving which process link drive according with moving relationship among three knitting triangles.