Preparing method and device for recycling 3D printing materials

The invention discloses a preparing method and device for recycling 3D printing materials. The method comprises the following steps that S1, collected waste hard plastic and 3D printing waste are broken through a plastic breaking machine to form a raw material, the broken raw material is put into a treatment device to be cleaned, and drying is carried out under the environment of 30 to 40 DEG C; S2, the raw material dried in the S1 and a modified mixing agent are mixed and stirred evenly in the treatment device, after uniform stirring, the mixed raw material is taken out and put into a heatingdevice to be heated to 160 to 200 DEG C, and stirring dissolving is carried out for one to two hours, and a solid raw material is obtained; S3, the solid raw material obtained in S2 is put into a plastic pulverizer to be pulverized, a rapid coagulating agent is added for uniform mixing, the mixed plastic powder is added into a screw extrusion molding machine, under the condition that the temperature ranges from 100 to 12