The invention discloses a dry-mixing system for casein production. The dry-mixing system comprises a tank body conveying line. A tank arranging platform is arranged at one end of the tank body conveying line; a spoon putting machine is arranged on one side of the tank arranging platform; a filling machine is arranged on one side of the spoon putting machine; two cover sealing machines are arranged on one side of the filling machine; a packaging machine is arranged on one side of a tank turning and cleaning machine; a feeding inlet of the filling machine is connected with a pulse spraying-type dry-mixing machine through a pipeline; a feeding inlet of the pulse spraying-type dry-mixing machine is connected with a pre-mix conveyor through a pipeline; a feeding inlet of the pre-mix conveyor is connected with a fluidized bed powder conveyor through a pipeline; and a sterilization batch feeder is arranged on the pipeline between the fluidized bed powder conveyor and the pre-mix conveyor. Compared with a general milk powder dry-mixing conveying production line, the dry-mixing system is more convenient to use and higher in efficiency, and full-automatic processing is adopted, so that sanitation and safety are achieved, and the problem that a milk source is away from a processing factory, the transportation time is excessively long, and consequently, milk goes bad is solved.