A continuous punching system for high-precision plastic pipes comprises a bottom plate, a supporting device, support devices, electric cylinder devices, clamping devices and a punching device. The bottom plate is provided with first supporting blocks and first rollers. The supporting device comprises a supporting plate, first supporting rods, a first transverse rod, a second supporting rod, second transverse rods and third supporting rods. Each support device comprises a first support, a second support, a fourth supporting rod and a third transverse rod. Each electric cylinder device comprises an electric cylinder, a pulling rod, a motor and an output shaft. Each clamping device comprises a first fixing rod, a clamping rod, a first fixing block, a clamping block, a fixing ring and a pulling line. The punching device comprises a cylinder, a punching rod, a third support, a positioning rod, fourth transverse rods and connection rods. The system can be used for automatically punching the plastic pipes and is high in punching efficiency and quick to use.