A servo self-locking track clamping device, comprising a pressure plate assembly and a clamping assembly, wherein: the pressure plate assembly includes pressure plate holders fixedly connected with lower beam of port machinery; the number of the pressure plate holders is two; the two pressure plate holders are arranged opposite to each other along extending direction of a track; the clamping assembly is located between the two pressure plate holders; the pressure plate holders are provided with a pressure plate for pressing the clamping assembly; the clamping assembly includes a thrust bracket, a clamp mechanism, and an opening and closing mechanism connected in sequence; the thrust bracket includes a frame, the clamp mechanism includes a bracket and clamping arms; the bracket is horizontally slidably installed on the frame; the number of the clamping arms is two; the two clamping arms are symmetrically arranged on both sides of the track; the opening and closing mechanism includes a hydraulic cylinder; characterised in that the thrust bracket further includes a roller, pressure bearing plates and a clamping plate; the roller is arranged at the lower part of the frame and connected with top surface of the track; the number of the pressure bearing plates is two; the two pressure bearing plates are respectively provided at two ends of the frame, and are used to bear the pressing pressure applied by the pressure plate; the clamping arms are rotatably installed on the bracket; the two ends of the hydraulic cylinder are connected to the upper ends of the two clamping arms respectively; the length of the hydraulic cylinder is stretchable to make the lower ends of the two retractable arms rotate close to and fit with the two sides of the track, or rotate far away and separate from the two sides of the track; the clamping plate is arranged on the upper part of the frame, and is sandwiched between the two clamping arms; the two sides connected to the clamping plate and the clamping arms are both curved surfaces that are concave in the horizontal direction. the pressure plate assembly includes pressure plate holders fixedly connected with lower beam of port machinery; the number of the pressure plate holders is two; the two pressure plate holders are arranged opposite to each other along extending direction of a track; the clamping assembly is located between the two pressure plate holders; the pressure plate holders are provided with a pressure plate for pressing the clamping assembly; the clamping assembly includes a thrust bracket, a clamp mechanism, and an opening and closing mechanism connected in sequence; the thrust bracket includes a frame, the clamp mechanism includes a bracket and clamping arms; the bracket is horizontally slidably installed on the frame; the number of the clamping arms is two; the two clamping arms are symmetrically arranged on both sides of the track; the opening and closing mechanism includes a hydraulic cylinder; characterised in that the thrust bracket further includes a roller, pressure bearing plates and a clamping plate; the roller is arranged at the lower part of the frame and connected with top surface of the track; the number of the pressure bearing plates is two; the two pressure bearing plates are respectively provided at two ends of the frame, and are used to bear the pressing pressure applied by the pressure plate; the clamping arms are rotatably installed on the bracket; the two ends of the hydraulic cylinder are connected to the upper ends of the two clamping arms respectively; the length of the hydraulic cylinder is stretchable to make the lower ends of the two retractable arms rotate close to and fit with the two sides of the track, or rotate far away and separate from the two sides of the track; the clamping plate is arranged on the upper part of the frame, and is sandwiched between the two clamping arms; the two sides connected to the clamping plate and the clamping arms are both curved surfaces that are concave in the horizontal direction.