The invention discloses a continuous production method of ethoxyquinoline. The method comprises the steps of continuously adding a raw material p-phenetidine liquid, an acid catalyst p-toluene sulfonic acid and half of liquid solvent methylbenzene for dehydration to the top of a tower reactor through a material distributing kettle; carrying out dehydration-condensation reaction on the obtained mixture and mixed steam of a raw material acetone steam and the other half of the solvent methylbenzene steam for azeotropic dehydration in the tower reactor; continuously discharging condensation products from the bottom of the tower and carrying out water washing and neutralization on the products; continuously discharging the water and a mixed gas of methylbenzene azeotropic steam and part of unreacted acetone steam which are produced in the reaction out of the reactor and condensing into liquid; continuously separating into a methylbenzene phase and a water phase; returning the methylbenzene to the system to recycle; and purifying the water solution containing part of acetone through rectification and recycling the acetone. The method disclosed by the invention has the advantages of increasing the production capacity of a single production line of the ethoxyquinoline, increasing the reaction efficiency and shortening the reaction time.