The disclosed invention relates generally to a method and device for transferring a file. In accordance with one embodiment, the method may include, receiving a file transfer request including information of a file and the file receiver; separating the file into multiple file segments; pushing the multiple file segments to the file receiver; if receiving a retransfer request sent by the file receiver, pushing the file segment assigned by the retransfer request to the file receiver; if receiving an acknowledgement sent by the file receiver, ending the file transferring, the acknowledgement indicating all of the multiple file segments being received by the file receiver. The method and device provided in the disclosed embodiments can transfer file more reliable.