Method for continuously preparing Ishikawa fluorinating agent and reaction device realizing method

The invention discloses a method and a reaction device for continuously preparing an Ishikawa fluorinating agent. The method comprises the following steps of mixing dichloromethane and diethylamine by virtue of a jet mixer to obtain a mixture, cooling the mixture by virtue of a cooler, mixing the cooled mixture and hexafluoropropylene by virtue of a jet mixer and fully reacting in a static mixer and rapidly cooling by virtue of a cooler. The entire process is rapidly completed in a few seconds and the problems of long reaction time and multiple side reactions are effectively solved. The reaction device comprises a primary jet mixer, a primary cooler, a secondary jet mixer, the static mixer and a secondary cooler which are sequentially arranged and has the advantages of simplicity in structure and convenience in use.