Powder spreading device, three-dimensional printing device, and three-dimensional printing system

A powder spreading device, comprising:

• a device body;
• an adjustment assembly;
• and a dust removing mechanism;
• wherein the adjustment assembly is provided on a lower side of the device body;
• the adjustment assembly is configured to orient toward a powder spreading surface;
• the dust removing mechanism comprises a dust removal cover and a dust removal pipeline, the dust removal cover is disposed to cover the adjustment assembly, one end of the dust removal pipeline is communicated with the dust removal cover, and the other end extends to the outside of the device body;
• and
• the dust removing mechanism comprises a dust collection hood;
• the device body is provided with an opening opposite to the adjustment assembly;
• the dust collection hood is provided over the opening;
• and the dust collection hood is configured to extend towards the adjustment assembly through the opening.