Brand new S1 sub-boiling acid purifier adopts classic sub boiling distillation mode to achieve dynamic balance between heat radiation and the speed of evaporation automatically. The user friendly intelligent structure design enhances the operation experience and enables total automatic control inside fume hood. The main body of the instrument is made of high purified PTFE which eliminates the containmination possibility from the usage of Quartz or metal accessories. It can be applied in continuously purifying HNO3, HCL, HF and water and decrease the metal residue from 1ppb level to 10 ppt level during the purification. The instrument is free from consumables, easy for maintenance and low operation power consumption.