A device of a smart sensing system, comprising a base and a data acquisition device; wherein the data acquisition device comprises a housing, a detection radar, a camera, an USB port, a wifi antenna, a GPS antenna, an inertial navigation system and a main board, the inertial navigation system and the main board are provided in the housing; the wifi antenna, the GPS antenna, the detection radar and the camera are provided on the housing, the wifi antenna, an output end of the detection radar and an output end of the camera are communicatively connected to the main board, respectively; the GPS antenna is communicatively connected to an input end of the inertial navigation system, and an output end of the inertial navigation system is communicatively connected to input ends of the camera and the detection radar; the USB port is provided on the housing and is communicatively connected to a memory on the main board; a bottom of the housing is provided with at least one guide rail, and a top of the base is provided with a guide groove that fits the guide rail; a side wall of the guide groove is provided with a locking means; the guide rail is mounted in the guide groove, and the guide rail is locked in the guide groove by the locking means; the base is provided with a sliding groove communicating with the guide groove, and is provided with means for fixedly mounting the base on a mobile carrier, e.g. a vehicle body; the locking means comprises an adjusting handle, a first spring, and a sliding block mounted in the sliding groove in a sliding manner; the sliding block is provided therein with a threaded hole and a first mounting hole, one end of the first spring is mounted in the first mounting hole, and the other end abuts against the base; and the adjusting handle passes through the threaded hole and is connected to the base, and the sliding block is capable of moving into the guide groove and clamping a surface of the guide rail tightly after the adjusting handle is rotated. the data acquisition device comprises a housing, a detection radar, a camera, an USB port, a wifi antenna, a GPS antenna, an inertial navigation system and a main board, the inertial navigation system and the main board are provided in the housing; the wifi antenna, the GPS antenna, the detection radar and the camera are provided on the housing, the wifi antenna, an output end of the detection radar and an output end of the camera are communicatively connected to the main board, respectively; the GPS antenna is communicatively connected to an input end of the inertial navigation system, and an output end of the inertial navigation system is communicatively connected to input ends of the camera and the detection radar; the USB port is provided on the housing and is communicatively connected to a memory on the main board; a bottom of the housing is provided with at least one guide rail, and a top of the base is provided with a guide groove that fits the guide rail; a side wall of the guide groove is provided with a locking means; the guide rail is mounted in the guide groove, and the guide rail is locked in the guide groove by the locking means; the base is provided with a sliding groove communicating with the guide groove, and is provided with means for fixedly mounting the base on a mobile carrier, e.g. a vehicle body; the locking means comprises an adjusting handle, a first spring, and a sliding block mounted in the sliding groove in a sliding manner; the sliding block is provided therein with a threaded hole and a first mounting hole, one end of the first spring is mounted in the first mounting hole, and the other end abuts against the base; and the adjusting handle passes through the threaded hole and is connected to the base, and the sliding block is capable of moving into the guide groove and clamping a surface of the guide rail tightly after the adjusting handle is rotated.