The invention relates to a positive temperature coefficient heat-sensitive material and a preparation method thereof, and belongs to the technical field of a heat-sensitive material. The positive temperature coefficient heat-sensitive material is prepared from a raw material comprising the following constituents: one of a strontium source and a lead source, a titanium source, a manganese source, ametal oxide and a combustion-assisted agent, wherein the mole ratio of the strontium source or the lead source, the titanium source, the manganese source, the metal oxide and the combustion-assistedagent is (99-99.5):(100.85-100.95):(0.04-0.05):(0.2-0.5):(0.1-0.2), and the metal oxide is an arbitrary oxide of Nb, Ta, Bi, Sb, Y and La or a combination of the oxide. A resistance value of the positive temperature coefficient heat-sensitive material is increased in a stepped way with temperature rising when a certain temperature (Curie temperature) is exceeded, the material has small resistanceat a temperature below the Curie temperature, and a positive temperature coefficient (PTC) layer has temperature sensitivity by the material.