The utility model discloses a head cam of a multi-bar warp knitting machine, comprising a wheel disk and a flange which is provided with a plurality of shaft holes and integrated into a whole with the wheel disk, which is characterized in that the periphery of the wheel disk is an outer curved surface with an upward motion section and a downward motion section; the outer curved surface of the wheel disk controls the motion of the head; the other side of the wheel disk opposite to the flange is provided with an inner curved surface which is conjugated with the outer curved surface of the wheel disk; the utility model has the advantages that the structure is reasonable and simple, the craft requirements of multi-bar warp knitting machines are met and the productivity and product quality of fabrics are improved significantly.