The invention provides a network mapping method and device for files. The network mapping method for the files comprises the following steps: an FIFO_IN file is created in a source host, and a target host logs in to the source host through SSH; an FIFO_OUT file is created in the target host; the FIFO_IN file is redirected to the FIFO_OUT file through an SSH tunnel and a named pipe, so that a mapping relationship between the FIFO_IN file and the FIFO_OUT file is established; a source file or a source process output is written into the FIFO_IN file in the source host; the source file or the source process output is mapped from the FIFO_IN file to the FIFO_OUT file through the mapping relationship; and a target process in the target host reads the source file or the source process output from the FIFO_OUT file. The method and the device provided by the invention have the advantages that the security of cross-host file mapping and transmission can be improved; meanwhile, disk space is not occupied during actual transmission, and multiple processes can be executed at the same time, so that time consumption caused by disk accessing is reduced.