Linearized correction method and device of thermistor

The invention provides a linearized correction method and a linearized correction device of a thermistor. An actual parallel resistance value set is obtained by providing a theoretical parallel resistance value for reference during a correction process, and the straight line of a linear relationship between the parallel resistance value set and a temperature is further obtained by fitting through a binary linear function, a resistor with a selective resistance value is connected to the thermistor in parallel after passing through a final error detection, and the fitting linear function is stored in a controller; because the characteristics of the linear function are superior to those of index calculation, thus the needs of running hardware are lowered, the execution efficiency is high, and the need of real-time performance is met.