Abstract: A human tumble detecting and alarming device includes an external shell body, a sensor module for detecting body postures of an object to be detected in real time, a data processing module for analyzing information detected by the sensor module and judging whether the detected object tumbles or not according to analyzing results, a wireless communicating module connected to the data processing module and a power source module for respectively supplying the sensor module, the data processing module and the wireless communicating module with electricity. The sensor module is a triaxial acceleration sensor. The sensor module, the data processing module, the wireless communicating module and the power source module are all provided within the external shell body. The human tumble detecting and alarming device is simple in structure, small-sized, portable and easy to operate.