The invention discloses a tung oil-based dual-crosslinking resin monomer, and a preparation method and an application thereof. The preparation method comprises the steps: taking Tung oil and methanolas raw materials, and preparing methyl eleostearate through transesterification reaction under the catalysis of sodium hydroxide; then, carrying out a reaction of methyl eleostearate and methyl acrylate, and preparing tung oil-based dimethyl ester; carrying out a hydrolysis reaction on tung oil-based dimethyl ester, to obtain tung oil-based dibasic acid; carrying out a reaction of tung oil-based dibasic acid with a proper amount of a catalyst, an oxygen carrying agent formic acid and hydrogen peroxide to obtain tung oil-based hydroxylated dibasic acid; and carrying out a reaction of the tung oil-based hydroxylated dibasic acid with a proper amount of a catalyst, epoxy chloropropane, sodium hydroxide and calcium oxide to obtain tung oil-based dual-crosslinking resin monomer molecules. Methyl eleostearate is selected as the raw material to prepare the dual-crosslinked resin monomer product, environment-friendly resources are fully utilized, the product can be subjected to a dual-crosslinking reaction, and a crosslinked polymer has excellent mechanical strength.