1. A file transfer security system, comprising: a storage system; at least one processor; and a file transfer securing unit stored in the storage system and being executable by the at least one processor, the file transfer securing unit comprising: an interception module configured to intercept a file transfer request sent to a file server from a client computer, and record relevant information of the file transfer request, wherein the relevant information of the file transfer request comprises a user ID, a request time of the file transfer request, an IP address of the client computer, a file name of a file of the file transfer request, and a file size of the file; an analysis module configured to assess the need for examination of the file transfer request according to the relevant information; a notification module configured to notify an auditor to examine the file transfer request and award approval or rejection thereof, wherein the auditor is selected according to the user ID; a receiving module configured to sort the relevant information according to the request time, generate a webpage with the sorted relevant information provided to the auditor to examine the file transfer request, and receive an examination result from the auditor; and an execution module configured to execute file operations according to the examination result.