This application provides an application download monitoring method and a device. A mobile terminal detects whether access URL information requested by a plurality of first applications includes an application download request; when detecting that access URL information requested by any one of the plurality of first applications includes an application download request, the mobile terminal blocks the application download request, and sends the URL information to a server; the server queries, based on the application download request in the URL information, whether a security analysis result of a second application corresponding to the application download request exists, and if finding the security analysis result, the server sends the security analysis result to the mobile terminal; and the mobile terminal determines, based on the security analysis result, whether to download the second application.