The utility model provides a water heating device of heat exchanger evaporation test, this test device of is mainly connected gradually by one -level water tank, second grade water tank, heater and water pump and forms, wherein inlet of heater and steam are connected, are equipped with the condensation on the concurrent heating ware and discharge. The utility model discloses polytype large -scaleheat exchanger such as plate heat exchanger, shell and tube type heat exchanger, spiral plate heat exchanger can be carried out and the heat transfer performance test of medium for vapour - water is carried out. The problem of in evaporation test control by temperature change inaccuracy, to add less and time of hot water volume longer etc. Technical is solved. Internal to one set of the most ripetest device in this type experiment at present.