Injection water preparation device

The invention relates to an injection water preparation device. The injection water preparation device comprises a first condenser, a preheating assembly, a first evaporator, an evaporation assembly and a degassing tank. High-temperature steam can heat high-temperature water in the third heat exchange channel in the flowing process of the fourth heat exchange channel, meanwhile, the high-temperature steam is condensed, and the high-temperature steam which is not condensed enters the second heat exchange channel of the preheating assembly to exchange heat with the first heat exchange channel and then enters the degassing tank; and after degassing in the degassing tank is finished, non-condensable gas is discharged outwards through a first waste discharge pipe, and condensed liquid is introduced into a first liquid inlet of the first condenser and is discharged outwards through a first liquid outlet. Therefore, the non-condensable gas is separated through the degassing tank and discharged through the first wast