Preparation method of high-content 2-chloro-5-chloromethylthiazole

The invention discloses a preparation method of high-content 2-chloro-5-chloromethylthiazole, which comprises the following specific steps: (1) reacting 1-isothiocyanate-2-chloro-2-propylene with a chlorinating agent to obtain a reaction solution containing key by-products, adding a saturated sodium chloride solution, and continuously reacting to the end point; separating a desalted water layer, and desolventizing and degassing an organic layer to obtain a 2-chloro-5-chloromethylthiazole crude product; (2) carrying out reduced pressure rectification on the 2-chloro-5-chloromethylthiazole crude product through a high rectification tower, and removing the front fraction until the main fraction is stable; and directly carrying out reduced pressure distillation through a low rectifying tower to obtain the product. According to the invention, key by-products are completely converted into products without producing polymers, so that the product conversion rate is greatly improved; the combined rectification of the