Method and device for measuring environment temperature through RFID tag

The invention relates to a method for measuring environment temperature through an RFID tag. The method comprises the following steps that a test instruction is sent to the RFID tag; the RFID tag performs counting on seekers of the test instruction and obtains hold time; the RFID tag returns the obtained count value to a reader; the reader obtains a frequency parameter value of a current tag oscillator according to the received count value; the RFID tag sends a parameter value of a quadratic curve to the reader; the obtained parameter value of the quadratic curve and the obtained frequency parameter value are substituted into a quadratic curve expression to be solved to obtain the current temperature value of the environment where the RFID tag is located. The invention further relates to a device for implementing the method. The method and device for measuring the environment temperature through the RFID tag have the advantage that designing difficulty and hardware cost are both low.