The invention discloses a network data optimizing method, a device and a network server to solve the problem of processing network content by a WEB server. The network data optimizing method includes the steps of obtaining a terminal processing capacity set and a terminal compressing algorithm capacity set through interaction with a terminal, adjusting the network content returned to the terminal through invoking of a preset content adjustment function library according to the terminal processing capacity set and the terminal compressing algorithm capacity set so that the adjusted network content fits in with the processing capacity of the terminal, compressing the adjusted network content by selecting a first compression algorithm and returning the adjusted and compressed network content to the terminal. The network data optimizing method, the device and the network server has the advantages of adjusting the content and selecting the optimal compression algorithm at a WEB server-side to be adapted to practical application of the terminal by combining the processing capacity with display capability of the terminal, and selecting whether compressing and adjustment are conducted or not according to feedback conditions of processing quality of the terminal.