Filamentous fungi, which present distinct morphology and cell structure, play a critical role in human health as well as industrial and agricultural production. However, the unique characteristics of filamentous fungi make them difficult to be manipulated with traditional genetic engineering methods. Thus, the development of an efficient gene editing system is essential for exploring biological resources and understanding metabolic processes in filamentous fungi. The development of the Clustered Regularly Interspaced Short Palindromic Repeats/CRISPR associated protein (CRISPR/Cas) system promotes more efficient and effective gene editing in different species, and brings a revolutionary breakthrough in fungal fundamental research and applications. In this review, we first briefly introduce the history, working mechanism, and classifications of the CRISPR/Cas mediated gene editing system. Next, we comment the functional components of CRISPR/Cas9 such as selective marker, Cas9 and gRNA and the delivery methods of these components in various filamentous fungi. Furthermore, we systematically discuss the applications of CRISPR related technologies, including CRISPR/Cas12, base-editor, CRISPRa, CRISPRi and CRISPR mediated epigenetic regulation, in the genetic engineering of filamentous fungi, particularly in marine-derived filamentous fungi. Finally, we address challenges with relative low gene editing efficiency and off-targets effects in engineering filamentous fungi, and highlight the potential solutions for developing novel CRISPR/Cas-based gene editing systems. This review can provide guidance for developing an efficient gene editing platform in filamentous fungi and pave the way for further exploration of the secondary metabolites and establishment of robust fungal cell factories.