Bacterial biofilms infection is one of the major factors causing delayed wound healing. Therefore, early diagnosis of bacterial biofilms is critical for successful cure of chronic wounds. Although many techniques have been developed to diagnose the free pathogens in infectious wounds, there is no technique which can quickly and accurately identify bacterial biofilms in wounds. In this paper, the mechanism of bacterial biofilm formation is briefly reviewed, and several potential diagnostic techniques for bacterial biofilms are introduced, which are expected to be a means of rapid diagnosis and monitoring of bacterial biofilms in wounds.