The embodiment of the invention discloses a wireless serial port device and a design thereof. According to the using method and the server applying the device, the wireless serial port device comprises an endpoint card and a root card, the root card is used for converting a serial port communication mode of equipment into a wireless communication mode, and the endpoint card is used for convertinga communication mode of an upper computer into a wireless communication mode; Wherein the root card comprises a first wireless module, the endpoint card comprises a second wireless module, and the first wireless module and the second wireless module are in wireless communication. According to the invention, the wireless communication module is utilized to realize the wireless communication betweenthe serial port equipment in the server and the upper computer; The upper computer can remotely control the server, cables are not needed, chaos caused by winding of a large number of cables during debug is avoided, the root card can be integrated in a case, communication with serial port equipment in the server is facilitated, and the product competitiveness of the server is enhanced.