The invention discloses a knowledge base construction platform based on a cloud document management system. The knowledge base construction platform comprises a data uploading module, a file management module, a directory management module and an unstructured data search module. The data uploading module is used for service registration of file uploading, file uploading progress monitoring and file uploading processing. The file management module is used for auditing, checking, classifying, sharing, deleting and flow tracking operation on the uploaded data file. The directory management moduleis used for establishing and managing a file directory. The unstructured data search module is used for retrieving documents. According to the invention, the files in the platform can be orderly arranged through the file management module and the directory management module, so that a user can accurately and quickly inquire the required files. The file storage space of the platform is effectivelyexpanded through the cloud document management system.