The invention discloses a combined type water-passing cooler. The combined type water-passing cooler comprises a cooler inner core sleeve, a cooler shell and a cooling pipe, wherein one end of the cooler inner core sleeve is provided with external threads; the cooler shell is in threaded fit with the cooler inner core sleeve; the cooler inner core sleeve is extended into one end of the cooler shell and is matched with the cooler shell to form a jet orifice which consists of a water gap with a certain tapered annular shape; and the cooling pipe is connected with the cooler shell. The cooler shell is matched with the cooler inner core sleeve to form the jet orifice with a reasonable jet angle. The jet orifice consists of the water gap with a certain tapered annular shape, wherein the size of the water gap can be adjusted according to the requirement of a water-passing process; and the structure of the water gap is different from that of a diagonal water gap of a direct jet type cooler and is also different from that of an orifice jet type water gap of a turbulence tube type cooler. The combined type water-passing cooler has the advantages of realizing elastic control on the mechanical properties of a water-passing reinforcing steel bar or water-passing round steel and solving the quality problem that wave bending phenomenon occurs easily after water-passing rolling is performed on a small-size reinforcing steel bar through test certification.