The invention discloses a groove pin structure of a warp knitting machine. The groove pin structure comprises a main shaft, a pin body assembly and a pin core assembly, wherein the pin body assembly and the pin core assembly are driven by a pin body vertical movement mechanism and a core pore vertical movement mechanism to perform vertical movement and driven by a longitudinal movement mechanism to perform longitudinal movement, thus the compound movement of the groove pin can be realized. The device can synchronously move forward with cloth cover, so the groove pin has small resistance and is not easy to damage and is particularly suitable for knitting multi-axial textiles with higher density and thicker thickness. The device takes a plane link mechanism as a main member, has simple structure and low cost and is suitable for warp knitting machines with higher operating speed.