The invention claims a building preformed unit the mould system and its preparation method of preventing the mould system comprises a bottom layer of module unit and at least one upper layer of mould element of said upper layer mould unit is set on the edge of upper layer of the working platform said upper layer mould unit supported by the supporting frame the upper mould unit one side of the said bracket through rotating shaft can be rotatably connected with the said upper layer mould unit according to working needs from horizontal state upward turns over to vertical state or from the vertical state turning down to the water level state. The invention claims a building preformed unit of the mould system on the same place is set with at least two layers of mould element it improves land utilization rate of the invention greatly improves the prefabricated part of the production efficiency it is especially suitable for the land resource comparing the shortages of the area of.
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