本发明涉及一种高含量多聚甲醛的制备方法。其技术方案是:该工艺主要由以下步骤组成:甲醛溶液被输送到中间储罐中,并通过换热器使储罐中的溶液保持在适宜的温度;在一段蒸发中,甲醛溶液可被浓缩到55%-60%,浓缩过的溶液从蒸汽分离器输送到第二个蒸发装置;一段蒸发后的浓缩甲醛溶液可再次被浓缩,泵将再次浓缩后的甲醛溶液从蒸汽分离器送到第三段蒸发装置;浓缩后的甲醛溶液进行最后一段浓缩,泵把浓缩的甲醛溶液从中间储罐送到喷雾干燥装置; The invention relates to a method for preparing paraformaldehyde with high content. The technical scheme is that the process mainly consists of the following steps of: the formaldehyde solution is transported to an intermediate storage tank, and the solution in the storage tank is kept at a suitable temperature through a heat exchanger; during a period of evaporation, the formaldehyde solution can be concentrated To 55% -60%, the concentrated solution is sent from the steam separator to a second evaporation device; after a period of evaporation of the concentrated formaldehyde solution can be concentrated again, the pump will once again concentrate the formaldehyde solution from the steam separator to the Three stages of evaporation device; concentration of formaldehyde solution for the final paragraph of the concentrated pump concentrated solution of formaldehyde from the intermediate tank to the spray drying device;