The invention discloses a paint-spraying device. The paint-spraying device comprises an air inlet pipe, the air inlet pipe is connected with a paint-spraying head through a universal joint, and a paint container is externally suspended on the paint-spraying head. The paint-spraying head is provided with one or more paint-spraying rings, and the paint-spraying rings are formed by connecting multiple tooth-shaped slits in a head-to-tail mode. Air outlet rings are arranged on the inner side and the outer side of each paint-spraying ring, and a negative-pressure sucking ring is arranged on the edge of the outer side of the paint-spraying head. The height of the paint-spraying rings is larger than that of the air outlet rings, the paint-spraying rings and the paint-spraying head are concentrically and independently arranged, and spiral blades are arranged inside the paint-spraying rings. The paint-spraying rings are connected with the paint-spraying head through teflon seal rings in a sliding mode. The air inlet pipe is respectively connected to the air outlet rings and the paint-spraying rings, and the paint container is connected with the paint-spraying rings through atomizers. The defects in the prior art can be overcome, paint-sprayed surfaces are synchronously homogenized based on the aerodynamics principle, and paint-spraying processes and the device structure are simplified.