This invention discloses a digital light-
processing 3D printing photocurable resin composition, its printing method, and its applications. The digital light-
processing 3D printing photocurable resin composition includes a crosslinking agent, a
monomer, a
chain transfer agent, and a
photoacid. By introducing a thioacetal compound as a
chain transfer agent, this invention constructs a photoinitiated cationic degenerate
chain transfer polymerization system under the action of a
photoacid catalyst, achieving active / controllable regulation of the
polymerization process. The photocurable resin composition provided by this invention has a simple composition, requires no complex synthetic reagents, and can fundamentally eliminate
oxygen inhibition, achieving rapid and high-precision 3D printing with a maximum printing resolution of 57 μm.