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The present application relates to a 3-formylformic acid coumarin compound of formula (I), a preparation method and uses thereof, a photoinitiator composition and a photocurable composition comprising the same, a cured material obtainable from the photocurable composition, and a method for preparing a photocured material. The compound of the present application can be used as an oil-soluble photoinitiator and an aqueous photoinitiator, has obvious advantages in photosensitivity, is suitable for use as a photoinitiator for UV-VIS LED light source curing, can initiate free radical polymerization, and can also sensitize onium salt compounds such as iodonium salt or sulfonium salt to initiate cationic polymerization of epoxy monomers or oxetane monomers.