Abstract: An intelligent sensing device and a sensing system are disclosed. The sensing device comprises a sensor unit provided with a plurality of sensors, and a wireless communication module, a memory module and a processing module connected with a data platform, wherein the processing module is connected with the sensor unit, the wireless communication module and the memory module; the processing module acquires the motion condition of a user by means of a preset detection algorithm according to a detection result of the acceleration sensor; and the sensing device has multiple different modes corresponding to different preset detection algorithms, and the user selects the preset detection algorithm by setting the mode of the sensing device. The sensing device is extremely low in power consumption, good in stability and sensitivity and high in storage capacity, can be interconnected with the data platform, and allows various sensors to be accessed thereto.