The invention belongs to the field of chemical low-salt dense soda ash equipment, and particularly relates to a dense soda ash high-efficiency crystallization production device, a motor is started torotate to drive a stirring belt to rotate, a gas flow generated by the rotation of a gas in a crystallization furnace along with the stirring belt spirally ascends, the gas on the upper side of the crystallization furnace extrudes a pressure valve on a second fixing plate through an one-way valve, the gas pressure is increased, at the moment the gas pressure breaks down the pressure valve, the gaspressure pushes a sliding plate and a first pressure plate on the upper side of the crystallization furnace to slide downwards, and a spring is stretched; steam in a steam chamber enters the crystallization furnace, the gas pressure is increased, at the moment the gas pressure breaks down a pressure valve at the lower side of the crystallization furnace, the gas pressure pushes a sliding plate and a second pressing plate on the lower side of the crystallization furnace to slide upwards, the spring is stretched, the spring rebounds to drive the sliding plate to slide back, and the sliding plate, the first pressing plate and the second pressing plate slide back and forth to stir crystal slurry in the crystallization furnace, so that the slurry is continuously circulated, and crystal grainsgrow continuously.