A manufacturing method of a heat-resistant tableware and a molded article of the heat-resistant tableware are provided. The manufacturing method of the heat-resistant tableware includes: providing a polyester composite material that includes 50 wt % to 85 wt % of polyethylene terephthalate, 0 wt % to 5 wt % of an organic nucleating agent, and 10 wt % to 30 wt % of an inorganic nucleating agent; and injecting the polyester composite material into a mold in an injection molding process, in which a mold temperature of the mold is controlled to be not less than 110° C., and a crystallinity of the polyester composite material in the mold is controlled to be between 20% and 30%, so that the polyester composite material is formed into the molded article of the heat-resistant tableware in the mold, and the molded article has a heat distortion temperature of not less than 150° C.