The utility model relates to a PTC macromolecular thermal resistor, comprising a macromolecular core-material layer, two electrodes and an encapsulated layer, wherein the electrodes are arranged at both faces of the macromolecular core-material layer; the electrodes are provided with connecting sheets respectively; the peripherals of connecting sheets and the macromolecular core-material layer are enveloped by the encapsulated layer. The PTC macromolecular thermal resistor has the advantages that: the lateral face of the macromolecular core-material layer is protected by the encapsulated layer and does not contact air, so the PTC macromolecular thermal resistor has good environment stability; the connecting sheets stand out the encapsulated layer, so the electrical connection between the macromolecular thermal resistor and the outside is not affected; the PTC macromolecular thermal resistor has the advantages of good environment stability, environment stability, and compact structure.