A　visible-light-enabled,　photocatalyst-free　hydroacylation　reaction　of　azodicarboxylic　acid　derivatives　was　described.　This　radical　conjugate　addition　(RCA)　protocol　relied　on　the　dual　role　of　4-acyl-1,4-dihydropyridine　(acyl-DHP)　reagents　that　besides　being　as　radical　reservoirs,　they　also　enabled　the　conversion　of　radical　adducts　to　anion　intermediates　via　reduction.　Under　＂catalyst-oxidant-additive　free＂　conditions,　a　wide　range　of　structurally　different　acyl　hydrazide　products　were　readily　obtained　in　56%-99%　yields.　The　utility　of　this　transformation　was　further　demonstrated　by　the　scale-up　synthesis　and　downstream　derivatization.