The invention discloses a differential type temperature controller detection probe based on electrical eddy currents and a lift-off eliminating device and method thereof. The lift-off eliminating device comprises a PC, an MC9S12XS128 single chip microcomputer system, an RS232 level switching circuit, a prompt device, an input signal photoelectric isolation circuit, an output signal photoelectric isolation circuit, a motor, a motor full-bridge driving circuit, a lower amplitude limiting contact, an upper amplitude limiting contact, a first magnet, a second magnet, a lifting device, a fixing mechanism and the differential type temperature controller detection probe. The differential type temperature controller detection probe based on the electrical eddy currents is adopted to carry out non-destructive testing, an electromagnetic ultrasonic effect is utilized, any coupling media are not needed, the detection speed is high, and production efficiency, detection sensitivity and reliability are high; the lift-off eliminating device is increased, so the fact that the probe is close to a temperature controller is guaranteed, a lift-off effect is eliminated, and sensitivity and accuracy of an eddy current detection probe are further improved; PC configuration software is utilized, so the working condition of the device can be monitored.