An axial flow mixer comprises a solid powder proportional valve, a liquid proportional valve and a mixing head which are connected in turn. These three parts all have inner cavity, all of which constitutes a cavity room which is communicated upward and downward and sealed; the solid powder proportional valve is used to add the solid powder and adjust the size of inlet; the inner cavity of the liquid proportional valve is used for the solid powder for passing and possess another passage which leads into the mixing head from outside, the purpose is to add liquid and adjust the size of the opening for the passage; the mixing head is used to mix all solid powder and liquid. The utility model can control the consumption of solid powder and liquid at the same time with small energy consumption.