This machine is of such structure as combines external circulation heating evaporator and condensed liquid retrieving equipment. It is an improved version of the conventional evaporation and condensation equipment, characterized by stable performance, high retrieving rate, compact structure and easy operation. In structure, the length of the arrayed tubes and the diameter of the evaporation chamber have been extended appropriately, so that the circulation speed and evaporation area has increased to enhance the evaporation capability. In condensation and retrieval, the condensed liguid or solvent has to go through two single and return condensation and cooling devices, thus the retrieving rate has been increased.