The invention relates to the technical field of low-temperature liquid vaporization equipment and particularly discloses a residual heat recovery type double-heat-source water bath vaporizer. An outer heat source water inlet in the vaporizer is fixedly welded to the lower portion of a water storage tank shell. The upper end and the lower end of an inner heat source circulating water pipeline provided with an inner heat source circulating water pump are welded to the top and the bottom of the water storage tank shell correspondingly in an inserted mode. A low-temperature liquid coil pipe is fixed in the water storage tank shell. The top of the low-temperature liquid coil pipe is fixedly welded to a vaporized gas outlet inserted into the top of the water storage tank shell. The bottom of the low-temperature liquid coil pipe is fixedly welded to a low-temperature liquid inlet inserted into and welded to the lower portion of the water storage tank shell. An outer heat source water outlet is installed at the top of the water storage tank shell. An inner heat source electric heater is further installed on the lower portion of the water storage tank shell. Through the vaporizer, the electricity utilization power of the electric heater is lowered greatly while large vaporization capacity is ensured,, use cost is lowered, and economy is good.