A copper thermal resistance thin-film temperature sensor chip comprises a substrate, a temperature sensor, and two electrode plates, the temperature sensor which has a plurality of electrically connected resistance elements is placed on the substrate, a portion of the resistance elements form a resistance adjustment circuit. Integrated circuit elements are deposited by thin-film technology. It consists seed layer, copper thermal resistance thin-film layer above the seed layer and passivation layer above the copper thermal resistance thin-film layer. Through semiconductor manufacturing and processing technology, the thermistor layer of this structure is to be fabricated into a serious of thermistor wires and then to form the temperature sensor, furthermore this temperature sensor has a resistance adjustment circuit which is used to adjust resistance value precisely. The preparation method of the sensor chip comprises depositing thin-film on the surface of the substrate, and then a final sensor chip can be obtained through the processing of magnetron sputtering, schematize, peeling, and etching. This sensor chip has the advantages of high impedance, excellent thermal stability, good linearity and low cost.