Dust collecting device and slurry mixing system

The invention provides a dust collecting device and a slurry mixing system, relates to the field of mixing equipment for slurry such as cement and the like and aims to reduce raised dust of powder during mixing and solve the problem of environmental pollution caused by the powder during mixing. The main technical scheme is that the dust collecting device comprises an outer barrel and an inner barrel, wherein the inner barrel is a through barrel with both ends open, a first end of the inner barrel is used for being connected with an output port of a powder conveyor, a second end of the inner barrel is a discharge port, and spray holes are formed in the inner side of the inner barrel; two ends of the outer barrel are connected with two ends of the inner barrel to wrap the inner barrel, an accommodating space is formed by the outer barrel and the inner barrel, and a water injection hole is formed in the side wall of the outer barrel and used for being connected with a water source. The dust collecting device can