A multifunctional portable power bank includes a main body having a circuit board and a battery arranged therein. The circuit board includes a first control unit, a second control unit connected to the first control unit, and a wireless transmission unit connected to the second control unit. The first control unit controls an input voltage of an external power supply and an output voltage of a battery power of the battery, and informs the second control unit to turn on. The second control unit enables a wireless access via the wireless transmission unit or an access via the Ethernet, and enables a router mode or a network service mode. With these arrangements, the multifunctional portable power bank not only enables data access via local or wireless networks, but also supplies electric power for charging other electronic products connected thereto.