The invention relates to a pen and particularly relates to an intelligent original handwriting recording pen based on inertia measurement, which mainly solves the technical problems of an existing intelligent pen that special patent paper needs to be used, the cost is high and the pen is not convenient to carry. According to the intelligent original handwriting recording pen based on the inertia measurement provided by the technical scheme, a USB (Universal Serial Bus) interface is arranged at the top of a pen holder; a microphone, a wireless communication module, a power supply managing unit, a processor, a pressure sensor, a battery, an acceleration sensor, an infrared lamp and a camera, and a refill connected with the pressure sensor are sequentially arranged in the pen holder from top to bottom. The processor is connected with the camera, the infrared lamp, the acceleration sensor, the pressure sensor, the wireless communication module, the microphone and the USB interface respectively; the power supply managing unit is connected with the battery, and is connected with the processor, the camera, the infrared lamp, the acceleration sensor, the pressure sensor, the wireless communication module and the USB interface respectively. The intelligent original handwriting recording pen can be used for writing on the paper and can be used for recording an original handwriting.