A mobile terminal handwriting pen is provided, and the handwriting pen is integrated with an earphone. The handwriting pen includes: a pen nib, which is an earphone plug; a pen body, one end of which is fixedly connected to the pen nib, and the other end is movably connected to a pen cap, wherein, an earphone cord is set within the pen body, and both ends of the earphone cord are respectively connected with the earphone plug and an earplug; and the pen cap, which movably cooperates and connects with the pen body and on which the earplug is set. The present invention has a simple structure and less production cost, and it is easy to be standardized and massively produced, which is convenient for usage and promotion.