Photosensitive resin used in 3D printing, and its preparation method

The invention provides a photosensitive resin used in 3D printing, and its preparation method. The photosensitive resin is prepared by using 35-40 parts of acrylate, 35-40 parts of epoxy resin, 20-30 parts of a diluent, 0.1-5 parts of an antifoaming agent, 0.1-5 parts of a leveling agent, 1-10 parts of a cationic initiator and 1-10 parts of a free radical photopolymerization initiator. The photosensitive resin prepared in the invention has the characteristics of fast forming speed, small irritation, simple process, low cost and the like, and can be directly applied in 3D printing to make products with complex structures.