The invention relates to a device and a method for detecting temperature characteristics of a temperature sensor. The device comprises an ohmmeter I, an ohmmeter II, an ohmmeter III, a heating furnace IV, a temperature controller V, a power supply circuit, a temperature sensor A to be measured, a temperature sensor B to be measured, a temperature sensor C to be measured, a sensor for controlling the temperature of the furnace, connectors XP1 / XS1-XP4 / XS4 and a panel. The detection method comprises the following steps of: turning on a power source of the device; presetting the furnace temperature and selecting temperature-raising output voltage; respectively measuring the changes of the temperature sensor A, the temperature sensor B and the temperature sensor C which correspond to the furnace temperature from a low temperature period to a high temperature period, recording a plurality groups of relevant data for the corresponding change of resistance in a table; and thereby analyzing the temperature characteristics of the temperature sensor. The method is simple, direct and directviewing, improves the detection precision and the detection efficiency of data, can save energy and reduce emission, not only can be used for researching the temperature characteristics of the temperature sensor, but also can be used for electricity experiment teaching.