The invention discloses a thick glass cup forming mechanism in the technical field of glassware production and manufacturing, and the thick glass cup forming mechanism comprises a forming machine body, the top of the forming machine body is fixedly provided with a material containing mechanism, the material containing mechanism comprises a feeding mechanism and an ejection mechanism, and the top of the material containing mechanism is rotatably provided with a material containing disc; the top of the material containing disc is fixedly provided with four lower die bases distributed in a circle, the top of the forming machine body is fixedly provided with a hydraulic rod, the bottom end of the hydraulic rod is fixedly provided with a connecting plate, the connecting plate is located over the material containing disc, and the bottom of the connecting plate is fixedly provided with a cooling cylinder and a pressing die core. In the process of pressing and forming a glass blank, a formed glass cup can be cooled, so that the glass cup can be quickly cooled and formed, the glass cup and a pressing mold can be quickly separated, workers can conveniently unload the glass cup, the glass blank can be continuously pressed and formed at a time, and a secondary processing process is avoided.