The invention discloses a synthetic method of vinyl norbornene. Dicyclopentadiene containing high concentration of cyclopentadiene and 1,3-butadiene are used as raw materials to react by the adoption of a multi-lateral-lines feed type tubular reactor. The multi-lateral-lines feed type tubular reactor is divided into multiple reaction sections. The front end of each reaction section is provided with a feed inlet. The feed inlet at the front end of a first reaction section is a main-line feed inlet, and the rest is lateral-line feed inlets. According to the invention, dicyclopentadiene containing high concentration of cyclopentadiene is poured into a reaction channel of the reaction section through the main-line feed inlet while 1,3-butadiene is poured respectively through the main-line feed inlet and any one or more multi-lateral-lines feed inlets into a reaction channel of a corresponding reaction section so as to synthesize vinyl norbornene. The invention has beneficial effects as follows: the method of the invention is continuously operated under conditions of high temperature and high pressure; and the method has strong controllability, high safety and high yield of vinyl norbornene.