The invention provides a temperature and pressure dynamic compensation method for a sensor.For sulfur hexafluoride mixed gas extracted to a sample gas chamber from GIS equipment, corresponding gas features are detected by the sensor a in the sample gas chamber, then converted into corresponding resistance value signals and output variably; the influences of the zero wander of the sensor a and field interference signals are excluded by using a bridge type compensation circuit, and the resistance value signals are converted into corresponding voltage signals; analog-digital conversion and signal amplification are carried out in a signal analyzing and processing module, the temperature sensor and a pressure transmitter are connected to obtain detection results of the temperature sensor and the pressure transmitter, and the detection results are used for carrying out temperature and/or pressure compensation on gas feature parameter values measured by the sensor a.