The invention relates to a ventilated plastic calabash master die which is made of plastics, wherein the integrated master die comprises master die vanes which are divided into several parts in the vertical direction, small ventilated holes are formed on the master die vanes, and transparent plastics can be used. Compared with the currently used gypsum master die, the plastic master die has the absolute advantages that plastic materials can be recycled but gypsum can not be recycled; the plastic master die has light weight and high strength and can be used for manufacturing finer patterns; the plastic master die has smooth surface and fine texture and can not generate bubbles; the plastic master die can prevent water and transmit light; the plastic master die can be repeatedly used for many times, can be scrubbed and can be sterilized easily; and the plastic master die has skillful manufacture and accurate positioning and can be opened easily. The transparent plastic master die can be used for observing growing process of the calabash, finding and removing the calabash of poor growth in time, correcting the culture process easily, summarizing the culture experience, increasing the pleasure of visibility, and manufacturing more three-dimensional, more beautiful and finer master die of the calabash.