The invention discloses a positive temperature coefficient macromolecular composite material for temperature sensing cables and a preparation method, and relates to a resistance positive temperature coefficient macromolecular composite material for analog quantity line type temperature sensing cables and a preparation method. The preparation method is characterized by comprising the following steps: adding an assistant polymer and inorganic conductive particles into a main polymer matrix, and mixing each component in an internal mixer, an open mill or a screw extruder to be shaped; and carrying out heat treatment and chemical or radiation cross linking treatment on the materials. The prepared macromolecular composite material can meet alarm temperature grade requirement of the temperaturesensing cables, has higher resistance positive temperature coefficient strength and better resistance positive temperature coefficient switching performance, meets temperature sensing alarm sensitivity requirement, and has stable structure. The analog quantity line type temperature sensing cables made of the material have the advantages of simple structure, high sensitivity, good repeatability, and the like.