The invention discloses a manufacturing method for a cooling supporting component of a walking beam-type heating furnace and the cooling supporting component, and relates to the technical field of heating furnaces. The manufacturing process of the cooling supporting component can be simplified, and manufacturing accuracy of the cooling supporting component is improved. The manufacturing method for the cooling supporting component of the walking beam-type heating furnace includes the steps that the preset section parameters, preset section factors and borne blank evenly-distributed loads of a longitudinal water beam of the cooling supporting component are acquired; the maximum bending moment and maximum deflection of the longitudinal water beam are obtained through calculation; strength and stiffness of the longitudinal water beam are verified according to the preset section factors, the maximum bending moment and the maximum deflection of the longitudinal water beam, and actual section parameters of the longitudinal water beam are determined; and the longitudinal water beam required is manufactured according to the actual section parameters of the longitudinal water beam. The cooling supporting component of the walking beam-type heating furnace involves the manufacturing method for the cooling supporting component of the walking beam-type heating furnace mentioned in the technical scheme. The cooling supporting component of the walking beam-type heating furnace provided by the invention is used for conveying and supporting blanks.