The invention provides a sensing system and a data processing method thereof. The sensing system comprises a sensor, a data acquisition module and a data processing module which are connected in turn, and is characterized in that: the data processing module is provided with a logical expression processing module; and the logical expression processing module processes sensor data acquired by the data acquisition module by adopting a logical expression. The data processing method comprises that: the sensing system senses environmental parameters by the sensor, acquires the parameter information of the sensor by the data acquisition module and transmits corresponding processing instructions according to processing rules by the data processing module. The data processing method is characterized in that: the sensor data acquired by the data acquisition module is processed in form of logical expression by the logical expression processing module.