Sensor signal detecting method and device

The invention discloses a sensor signal detecting method and device. The device comprises a voltage stabilizing module and a switch module. The voltage stabilizing module is connected with a first capacitor and an input terminal of a sensor to be detected in parallel to stabilize output signals of the sensor, and the output signals of the voltage stabilizing module are connected to the control end of the detecting device via a first resistor and to the collection end of the detecting device via a second resistor. The switch model is arranged between the control end and the collection end to control ON/OFF of a switch according to the input level of the control end, the control end inputs level signals which match the signal types of the sensor, and the signal types include passive and active signals. According to the detecting device and method, the problem that a detection circuit for an air-conditioner controller needs to be designed again due to change of user control demands is solved, the design of the detection circuit is simplified, the cost of components and space is reduced, and the compatibility and general degree of the system are improved.