Preparation method of vinylidene fluoride monomer and vinylidene fluoride monomer

In order to overcome the problem of pipeline blockage caused by carbon deposition in existing preparation of vinylidene fluoride, the invention provides a preparation method of a vinylidene fluoride monomer and the vinylidene fluoride monomer, and the preparation method comprises the following steps: obtaining carbonyl fluoride and a compound which is easy to generate ketene; the method comprises the following steps: mixing carbonyl fluoride and a compound which is easy to generate ketene, and introducing the mixture into a cracking tube for cracking reaction to generate a vinylidene fluoride crude product; purifying the vinylidene fluoride crude product to obtain a vinylidene fluoride monomer finished product; according to the preparation method of the vinylidene fluoride monomer, the carbonyl fluoride and the compound capable of easily generating ketene are adopted for the cracking reaction, the cracking reaction conditions are mild, carbon deposition and blockage of reaction equipment are reduced, the equi