Quantitative combined color mixing machine

The invention discloses a quantitative combined color mixing machine which comprises a quantitative feeding machine set, a roller opening and mixing machine, a big bin mixing machine set and a packer. The quantitative feeding machine set is provided with two quantitative feeding machines which are switched alternatively between a loading station and a feeding station at the same working time interval, and the quantitative feeding machine at the feeding station is used for conveying fibers with a certain weight into the roller opening and mixing machine through a mixing and cotton-conveying pipe. A cylinder and a doffer are arranged behind the roller opening and mixing machine, a cotton collector is arranged behind the doffer and used for conveying the fibers into the big mixing machine set through a cotton coagulating and conveying pipe; and the big bin mixing machine set is provided with two big bin mixing machines, each big bin mixing machine is internally provided with two stages of feeding flat curtains,