The invention relates to a multifunctional writing pen. The multifunctional writing pen can be used as a pen for writing, has the function of a laser pen, is also an emergency mobile power source anda USB flash disk. According to the multifunctional writing pen, the front section of the pen is a pen body which can be used for writing, a lithium battery is arranged in the middle of the pen, a mobile phone can be charged by virtue of a mini USB plug, in addition, the storage function is achieved so that the pen can also be used as the USB flash disk and can be directly inserted into the mobilephone to serve as the USB flash disk, the USB plug is arranged on a pen cap, and the USB plug can be directly connected to a computer as the USB flash disk for the computer by pushing out the USB plug; a laser lamp is arranged at the tail part of the pen, the mini USB plug on the middle battery part is inserted into a mini USB socket in the laser lamp, and power can also be supplied to the laser lamp in this way; when the laser lamp is charged, a mini USB interface is arranged on the side surface of the pen cap, the pen can be charged through the USB interface, a circle of convex body is arranged in the pen cap, a circuit is arranged on the convex body, a circle of groove is formed in the back of a pen point, and a circuit is arranged in the groove; and the whole circuits are connected when the pen cap covers the pen point.