The invention provides a wireless Internet mouse. The wireless Internet mouse comprises a mouse function module, and also comprises a wireless Internet card module, a USB interface module and a power supply management module, wherein the wireless Internet card module accesses a computer into a wireless wide area network; the USB interface module comprises a first USB interface and a second USB interface; the first USB interface is electrically connected with the mouse function module; the second USB interface is electrically connected with the wireless Internet card module; and the power supply management module is respectively connected with the first USB interface and the second USB interface electrically, manages the current input from the first USB interface and the second USB interface, reallocates the current, and respectively provides the current for the mouse function module and the wireless Internet card module. The embodiment of the invention also provides a power supply management method for the wireless Internet mouse. The wireless Internet mouse has a function of a mouse, can provide a net surfing function, only needs USB interfaces for providing power, does not need a battery, is very light and convenient, saves manufacturing cost and reduces safety risks.