The invention provides a making method and a making apparatus of a rubber product. The making method comprises the following steps: sequentially placing the extracted rubber product and a selected solvent in a closed space; heating to maintain the closed space at a predetermined temperature within a predetermined time to make the rubber molecules of the extracted rubber product dissolved in the selected solvent through a reverse reaction of a cross-linking reaction in order to form a rubber dissolution liquid; and filtering the rubber dissolution liquid, making a sample to be analyzed, and carrying out fine analysis on the rubber molecules through infrared spectroscopic analysis or liquid chromatographic analysis due to the complete reservation of rubber molecule chains in the sample to be analyzed.