The invention discloses a mold pressing technology. The technology process comprises the steps that prepreg is heated by an independent device, meanwhile, a mold is heated, the molten prepreg is quickly transferred into the mold, the mold and the prepreg are quickly pressurized, the mold is subjected to pressure maintaining and heat preservation, the pressure of the mold is released, the mold is transferred to the indoor temperature environment, and finally, demolding is conducted to so that a workpiece can be taken out. Through the technology, the performance uniformity and size precision ofthe workpiece made of a composite material can be improved, accordingly, the product percent of pass is increased, and the assembling difficulty is lowered.