The invention provides an electronic file processing method and device, and the method comprises the steps: receiving a first reading request sent by a terminal, with the first reading request comprising an identifier of a to-be-read chapter of an ePub file; extracting ePub chapter content corresponding to the identifier of the chapter to be read of the ePub file; wherein the electronic document cache comprises an analyzed ePub file, and the analyzed ePub file comprises identifiers of ePub chapters, contents of the ePub chapters and a corresponding relation between the identifiers of the ePubchapters and the contents of the ePub chapters; and sending the ePub chapter content corresponding to the identifier of the chapter to be read of the ePub file to the terminal, so that the terminal displays the ePub chapter content corresponding to the identifier of the chapter to be read of the ePub file on the webpage. The terminal does not need to carry out rendering, typesetting and the like on the file in the ePub format, and the speed of displaying the ePub file on line by the terminal is increased.