In the process of producing and flowing the wet mixer, the finished sand is humidified to avoid the problem of excessive dust during the operation of the material. The equipment runs smoothly, is easy to operate and maintain, has a wide range of applications, has good humidification effect, and is easy to control the water volume. In order to control the humidity of the finished product, in order to meet the application requirements of various sand powders, and has the characteristics of green environmental protection.