Disclosed in embodiments of the present invention are an operating mode switching method, wireless sensor and system. Said method comprises: determining, once a wireless sensor has entered a normal operating mode, whether physiological parameters are detected by the wireless sensor within a predetermined time period； and when no physiological parameters are detected by the wireless sensor within the predetermined time period, automatically controlling the wireless sensor to switch from the normal operating mode into a power saving mode. The present invention allows the wireless sensor to automatically enter the power saving mode when not being used without any action from a user, and therefore greatly improves the user experience.
