The invention discloses a mold rapid molding method based on cloud manufacturing. Steps of the method comprises: S1, based on a mold cloud manufacturing service platform, establishing online requirement interaction of mold demand sides, mold design teams / enterprises, mold rapid molding service providers, determining a mold model design scheme corresponding to the mold demand sides; S2, based on the mold cloud manufacturing service platform, performing online design analysis on the molds of the demand sides, to obtain a model file of the mold design scheme; S3, using inter-organizational interactive iteration of a three-dimensional model to repeatedly modify and improve the model file of the mold design scheme, submitting a final version model file of the mold design scheme to the mold demand side; S4, based on the mold cloud manufacturing service platform, converting the model files in different formats, to obtain model files in a standard STL format; S5, based on communication of the mold demand sides and the mold rapid molding service providers, using the model files in a standard STL format to manufacture molds.