The invention discloses a preparation method for difficult-to-deformation metal block material room temperature equal-diameter bending passage deformation; the method selects industrially pure titanium hot-rolling sheet material as raw material; after annealing, the industrially pure titanium hot-rolling sheet material is cut into blank; and then surface finish treatment is carried out on the blank, the included angle of the blank is phi=90 degrees to 110 degrees with the passage, and the inner surface of the cavity of a mould, exterior round corner of which is psi=10 degrees to 45 degrees, is coated with compound lubricant comprising molybdenum disulfide and graphite; and finally ECAP deformation is carried out in the room temperature. The invention can increase the room temperature intensity of the pure titanium and the comprehensive mechanical property thereof; in the preparation process, the lesser deformation passage number can be utilized for generating obvious detailing effect, thus obtaining high-strength industrial pure titanium by utilizing lesser passage number, reducing the treatment cost of the pure titanium and increasing rate of finished products.