A　radical-induced　1,2-alpha-boryl　migration　through　radical　polar　crossover　reactions　has　been　described.　In　this　work,　in　situ　formed　vinyldiboron　＂ate＂　complexes　from　alkenyl　Grignard　reagent　and　diborylalkanes　react　with　commercial　radical　precursors　under　light　initiation.　This　three-component　process　enables　diborylation　of　alkene.　This　protocol　features　high　atom　economy,　a　broad　substrate　scope　as　well　as　good　functional　group　toleration　with　mild　conditions.