The invention discloses a continuous production method of high imino methylated melamine formaldehyde resin. The continuous production method comprises the following steps: mixing para-formaldehyde and methanol, and de-polymerizing para-formaldehyde into formaldehyde under an alkaline condition; continuously feeding the de-polymerized mixture and melamine into a pipeline for reaction, and ensuring that the pH value of the material is alkaline in the reaction process, the reaction temperature is 65-70 DEG C, and the heat preservation reaction time is 10-12 minutes; after the reaction is finished, keeping the materials continuously flowing in the pipeline, cooling the materials to 39-41 DEG C, adjusting the pH value to 3-4, carrying out etherification reaction, keeping the temperature for 8-10 minutes, adjusting the pH value to be alkaline after the temperature is kept, and terminating the reaction; and taking out the material from the pipeline, carrying out reduced pressure distillation, removing water and methanol, then adding isobutanol, adjusting to a proper solid content, and filtering to obtain the product. The method has the advantages of being easy to operate, high in automation level, environmentally friendly, high in yield and the like.