The utility model provides a water preparation system for charged water flushing and a water preparation vehicle with the water preparation system for charged water flushing. The water preparation system comprises a submersible pump, water preparation equipment and a water tank; a water outlet of the submersible pump is connected to a water inlet of the water preparation equipment through a water pipe; a water outlet of the water preparation equipment is connected to the water tank; the water preparation system further comprises a stand-by power source and a power switching device; the power switching device comprises a main power input end, a stand-by power input end and a power output end; an output end of the stand-by power source is electrically connected with a stand-by power input end of the power switching device; and a power output end of the power switching device is electrically connected with the submersible pump and a power input end of the water preparation equipment. With the adoption of the water preparation system for charged water flushing, provided by the utility model, under the condition that no overhaul power source of an electric substation exists or an overhaul power source is powered down, the water preparation work can still be carried out normally through being powered by the stand-by power source, and the water preparation of charged water can be ensured to be smoothly implemented.