Benzoxazine monomer comprising vinyl benzene structure, and application and preparation method of benzoxazine monomer

The invention discloses a benzoxazine monomer comprising a vinyl benzene structure, and application and a preparation method of the benzoxazine monomer. The preparation method includes (1), enabling a vinyl aniline type compound (for example, 4-aminostilbene) to react with a salicylaldehyde type compound (for example, salicylaldehyde) to remove liquor to obtain Schiff base; (2), reducing the Schiff base to obtain secondary amine by a reducing agent; (3), subjecting the secondary amine to ring closure on the condition of existence of formaldehyde (or paraformaldehyde) to obtain the benzoxazine monomer comprising the vinyl benzene structure. Double polymerizable bonds are introduced into the benzoxazine monomer structure, and the monomer can be homopolymerized and copolymerized after being initiated by an initiating agent, so that the benzoxazine structure is introduced into a macromolecule, and obtained benzoxazine resin can be applied to the fields of electronic packaging materials, high-temperature-resistant flame-retardant materials, polymer latency cross-linking agents, comonomers and the like.