Continuous synthesis method of dimethyl acetylsuccinate

The invention discloses a continuous synthesis method of dimethyl acetylsuccinate, which comprises the following steps of: continuously pouring dimethyl maleate and acetaldehyde as raw materials into a high-pressure reactor for reaction in the presence of a radical initiator by using a high-pressure pump, continuously blanking reaction liquid, and finally obtaining the dimethyl acetylsuccinate. The method has the advantages of short reaction period, 95% or higher of conversion rate and 99% or higher of product purity. The dimethyl acetylsuccinate is the key intermediate for preparing novel environment-friendly food colors, such as dimethyl acetylsuccinate ketone carboxylate, namely lemon yellow, and the like.