3DP printing method based on purple sand

The invention discloses a 3DP printing method based on purple sand, and relates to the field of additive manufacturing. Purple sand raw ore particles, purple sand mud dry powder and polyvinyl alcohol are adopted to form a printing powder material, and an adhesive is prepared from one of deionized water, polyvinylpyrrolidone, glycerin/polyethylene glycol and one of ethyl alcohol/isopropyl alcohol; printing powder is put into a powder supply cylinder and a forming cylinder of a printer, and powder in the cylinders is spread out through a powder spreading roller; the binder is loaded into an ink box of the printer, in the printing process, when a powder laying roller completes laying of one layer, a spray head can spray a fixed amount of binder in a designated area under the control of a computer, printing powder can be condensed when meeting the binder, and so on; and taking out after the model is hardened, airing the model, and sintering. The method is simple and easy to implement, high in efficiency, high in