The utility model provides a mould closing mechanism of a full-
servo thermoforming machine, which is provided with a mould table lifting mechanism, the mould table lifting mechanism is assembled on a base, a lower mould table is connected above the mould table lifting mechanism, a
motor shaft is arranged in the base and used for being connected with the mould table lifting mechanism, and the
motor shaft is driven by a
servo motor. The end, connected with the die table lifting mechanism, of the
motor shaft is in a D shape, accompanying air cylinders are arranged on the two sides of the lower portion of the lower die table, and auxiliary air cylinders are arranged on the two sides of the upper portion of the base. The lifting mechanism comprises a horizontally-arranged support, a first connecting piece and a second connecting
assembly are connected below the support in series, namely the two ends of the first connecting piece are connected with the lower portion of the support and the second connecting
assembly through ball bearings respectively, and a D-shaped hole is formed in the lower portion of the second connecting
assembly and connected with a motor shaft. According to the utility model, the
servo motor is adopted to drive the mold table lifting mechanism, the structural matching is optimized, and the air cylinder is configured, so that the action process is labor-saving, the production efficiency can be improved, and the vibration and
noise generated by the mold during mold opening are reduced.