Disclosed are a building baseband unit, a baseband processing panel, and a failure processing method for the baseband processing panel. A direct path is introduced respectively for a baseband processing module and a power supply module in a baseband processing panel; when the baseband processing module has failed, the baseband processing module is directly bypassed, and a part of the baseband processing resources of a baseband processing panel in normal operation is allocated to an RRU corresponding to the failed baseband processing panel via a back panel and the direct path; and when both the baseband processing module and the power supply module have failed, both of them are directly bypassed, and a part of the baseband processing resources of a baseband processing panel in normal operation is allocated to the RRU corresponding to the failed baseband processing panel via the back panel and the direct path, and at the same time the power required for working is provided to an optical module via the back panel and another direct path. Applying the solution of the present invention can reduce implementation costs.