The invention discloses a cotton filling machine for doll production and a using method, and belongs to the technical field of toy production equipment.The cotton filling machine comprises a main body assembly, the main body assembly comprises a cotton feeding assembly and a processing box, the cotton feeding assembly comprises a machine shell, an induced draft fan and a collecting hopper, the induced draft fan is installed in the machine shell, the collecting hopper is welded to one side of the machine shell, and a feeding port is formed in the front side of the machine shell; the treatment box is installed at the top of the machine shell through bolts, a discharging cavity, a scattering cavity and a transition cavity are formed in the treatment box and are sequentially arranged from top to bottom, a through opening is formed in one side of the transition cavity, a material conveying pipe is installed between the through opening and the machine shell, and an auxiliary assembly and a scattering assembly are arranged in the treatment box; a cotton filling assembly is arranged on one side of the processing box, a control box is arranged on the processing box, and a power source, a control unit, a switch group, a first indicator lamp, a second indicator lamp and a digital display instrument are arranged on the control box. The fluffy fabric has the advantages of being good in fluffy effect and convenient to detect.