The invention relates to a lead-free high-Curie-point BaTiO3-based positive-temperature-coefficient thermal sensitive ceramic, and a preparation method thereof, and belongs to the field of ceramic with high technological functions, and applications of the ceramic with high technological functions. According to the preparation method, tetragonal perovskite BaTiO3 phase is taken as a matrix, (Bi0.5Na0.5)TiO3 is taken as a peak moving reagent of Curie point, rare earth oxide Ta2O5 or Sm2O3 is used for reducing room temperature electrical resistivity, and transition metal oxide MnO2 is added to increase resistance increasing ratio; one pot reaction is adopted to prepare the lead-free BaTiO3-based thermal sensitive ceramic; reduction-reoxidation sintering is adopted to obtain the BaTiO3-based positive-temperature-coefficient thermal sensitive ceramic with excellent heat sensitive properties. The preparation method comprises following steps: weighing, material mixing, ball milling, drying, sintering, grinding and sieving, pelletizing, tabletting, hydrocarbon removing, sintering, and coating with electrode. The lead-free high-Curie-point BaTiO3-based positive-temperature-coefficient thermal sensitive ceramic is high in Curie point and resistance increasing ratio, low in room temperature electrical resistivity, contains no lead, and is especially suitable to be used for preparing parts used for heating protection, overtemperature protection, overcurrent protection, and temperature monitoring and sensing.