The invention discloses a device and a method for preparing
sterile water for injection. The device comprises an upper tank body, a first filter device, a lower tank body, a secondary steam tank, a second filter device and a finished product collecting device, wherein
raw water enters the upper tank body, then partial impurities are filtered by virtue of the first filter device, steam is formed in the lower tank body, the steam is condensed, then secondary
evaporation is carried out by virtue of a secondary
evaporation tank, recondensation is carried out, then refined
filtration is carried out twice, finally
water quality is detected in the finished product collecting device, and after the
water quality meets various indexes, a detection tank is communicated with a finished product tank, water is put into the finished product tank, and the water in the finished product tank is subjected to encapsulation and then is subjected to sterilization treatment, so that the
sterile water for injection is obtained, and when the
water quality is unqualified, the water flows into the upper tank body again, and
processing is carried out again until the water quality is qualified. The device and the method which are disclosed by the invention have the advantages that water quality requirement is low, the device is simple in structure and easy to maintain, and the water quality is detected in real time, so that quality and service safety of the
sterile water for injection are improved; meanwhile, a preparation process is simple and easy to master, and preparation cost is effectively reduced.