The invention discloses gum barrier protection resin and a preparation method thereof. The resin is prepared from 40 to 70 parts of matrix resin, 20 to 40 parts of
diluent resin, 5 to 20 parts of
inorganic filler, 5 to 20 parts of ointment matrix, 0.1 to 0.5 part of initiator, 1 to 5 parts of auxiliary initiator and 0.1 to 1 part of
polymerization inhibitor. The resin has the characteristics of low heat release and moderate curing speed, can prevent heat generated by curing from burning gingival soft tissues, has higher
thixotropy, can be tightly attached to gingiva, can reliably isolate corrosive bleaching agents such as
peroxide and the like, and can be used for preparing gingival soft tissues. Adverse reactions such as gingival causalgia and
itching caused by solidification heat production and chemical irritant leakage are effectively reduced, and the gel is easy to smear, good in flexibility after solidification and easy to peel off integrally.