The invention discloses a light mixing cured coating composition which comprises epoxy acrylic acid monoester, ultraviolet light-heat mixing curing agent or ultraviolet light free radical-cation mixing curing agent, pigmented filler, reactive diluent, dispersing agent, defoaming agent and flatting agent. The invention also discloses a preparation method of the light mixing cured coating composition. The coating composition of the invention has small cure shrinkage and high bonding strength, can be applied to dark systems, can be used for coating some components with complicated structures, and can be used for coating surfaces of wood products, plastics, metals and the like by the construction methods of brush coating, spray coating, curtain coating, roller coating and the like.