The invention provides a method and a device for checking dead link of a web portal. The method comprises the following steps: distributing a plurality of sub-threads according to a check task list of the web portal; starting the sub-threads, causing the sub-threads to perform layer-by-layer breadth traversal check on the website started from the website inlet addresses of check tasks charged by the sub-threads, and writing the check result into a memory database; performing periodic polling check on the sub-threads; writing the check result recorded in the memory database by the sub-threads under a work-completing state into a local database; performing statistics on the dead link condition of the web portal according to the check result recorded in the local database. According to the method provided by the invention, the check efficiency of dead links is increased.