The utility model discloses an itaconic acid energy-saving-type four-effect concentrating and crystallizing device which can realize the continuity of concentration and crystallization of an itaconic acid solution, that is, a raw material liquid enters a preheater continuously so as to evaporate moisture continuously by a single-effect heating and evaporating device, a second-effect heating and evaporating device, a triple-effect heating and evaporating device and a quadruple-effect heating and evaporating device as well as a single-effect separator, a second-effect separator, a triple-effect separator and a quadruple-effect separator; secondary steam separated from the previous separator enters the preheater or the next heating and evaporating device so as to heat and evaporate materials; meanwhile, crystals separated from the quadruple-effect separator are pumped out continuously by a crystal slurry pump, so that the process that charging as well as evaporation and concentration are not simultaneously carried out and crystals are continuously extracted is formed, so that a great amount of crystals can be formed in the four-effect separators by materials; the yield and the product quality are improved; the device utilization ratio is increased; the steam consumption is reduced by 50%.