The invention relates to the technical field of man-hour quota establishment, is suitable for discrete type manufacturing enterprises with customized production, and particularly discloses a man-hour quota establishing system using customization as a tag and facing to a product family and a man-hour quota establishing method thereof, wherein the man-hour quota establishing method comprises the following steps: combining bottom-layer man-hour modules into a true man-hour module of a product by a true man-hour module constructing unit according to a product processing flow; constructing a false man-hour module by a false man-hour module constructing unit according to man-hour difference caused by the proficiency difference of production staff; and then determining the time quotas of the true man-hour module and the false man-hour module, and finally obtaining the final time quota of the product. In the invention, customized production is used as an object, a bottom-layer time module is used as a unit, the true man-hour module and the false man-hour module are used as carriers, and the time quota of the final product is organically integrated through the time quota of the true man-hour module and the time quota of the false man-hour module to achieve the purpose of efficiently, accurately and rapidly reconstructing the man-hour quota using customization as the tag and facing to the product family according to the individualized requirement of a user and the characteristic of the product.