The invention discloses a network audio-on-demand system and a method for acquiring network audio. The audio-on-demand system comprises a network audio playing device, a wireless on-demand pen, a network audio playing device and a network server. A user clicks an encoding carrier by using the wireless on-demand pen to acquire a network information identification code, after the network information identification code is sent to the network audio playing device to be processed, the network audio playing device is connected with the network server to acquire network information corresponding to the network information identification code, and the network information is played and outputted by the network audio playing device. Therefore, in the network audio-on-demand system, the conventional carrier information such as books and periodicals, magazines, the network audio and the like is combined, and the network information such as the network audio and the like is acquired immediately by operating the wireless on-demand pen; and the network audio-on-demand system is convenient to operate and expands and enriches the application range of the network information in digitalized period.