The utility model belongs to the technical field of waste heat recovery utilizes the electricity generation, a be suitable for steam waste heat type ORC power generation system's condenser is relatedto. This condenser includes cylindric tube, along radially setting up first tube sheet, first head is installed in the outside of first tube sheet on the terminal surface of tube, form first cooling chamber between first tube sheet and the first head, an axial pass partition is installed to first cooling intracavity, pass partition splits into two upper and lower cooling chambeies with first cooling chamber, along radially setting up the second tube sheet, the second head is installed in the outside of second tube sheet on another terminal surface of tube, form second cooling chamber between second tube sheet and the second head, the utility model discloses form a plurality of tube sides after will restraining the layering, working medium will experience N kind phase at the in -process that condenses and change, finally reach the supercooled state result in set position, simultaneously realize a second grade condensation in an equipment, strengthened coefficient of heat transfer, improve heat transfer efficiency.