Glucoraphanin (GRA), a secondary metabolite of plants, is a glucosinolate (GSL) derived from methionine. It is relatively stable in nature, and both GRA and its degradation product sulforaphane (SFN) play important roles in anticancer, neuroprotection, and other broad biological functions and health-benefits, and in particular, SFN has been reported as the best natural product for anticancer. In this article, we review the physicochemical properties, sources, biological functions, synthetic pathways, current production status of GRA, and discuss the potential strategy for the efficient biological synthesis of GRA in the future. The synthesis pathway of GRA involves three stages: side chain elongation, core structure information, and side chain modification. GRA can be converted into SFN and other active compounds by plant myrosinase (MYR) and intestinal microorganisms. Brassicaceae crops such as broccoli have high levels of GRA, and are currently the main source of GRA. However, the cultivation cycle of GRA-rich plants is long, and its extraction yield is low. Therefore, the development of economical and renewable new resources of GRA will greatly advance its applications. With the elucidation of the biosynthesis and regulation pathways of GRA, its genetic engineering-assisted efficient biological synthesis shows great potential, suggesting that the possibility for developing strategies with the manipulation of multiple genes for regulated expression at different dimensions to synthesize GRA more efficiently compared to the current mainstream strategy through manipulating single genes. This review focuses on the genetic engineering-assisted efficient biosynthesis of GRA in Brassicaceae crops, systematically outlining potential genes for engineering at each stage of GRA synthesis and highlights chassis crop species from the perspective of enrichment organs, aiming to providing ideas and strategies for the future regulation of GRA biosynthesis in plants through transgenic technology and molecular breeding for large-scale sustainable production of GRA.