File reissuing method and returning file sending method and device

The invention discloses a file reissuing method and a returning file sending method and device, and relates to the technical field of file transmission. A specific embodiment of the method comprises the following steps: determining at least one sending file sent to a receiving end in a first preset time period; combining the file identifiers of the sending files, and generating a list file corresponding to the first preset time period; sending the list file to the receiving end, and receiving a return file returned by the receiving end for the list file; comparing the list file with the return file, and determining a missing file; determining whether the missing file meets a reissuing condition or not; determining reissuing time according to current scene information in response to the fact that the missing file meets reissuing conditions; and sending the missing file to the receiving end according to the resending time. According to the embodiment, the risk that the receiving end cannot receive the file can