The invention provides a preparation method for a beta-crystal PPR pipe, and belongs to the technical field of chemical building materials. The heat resistance and the impact property of the PPR pipe are improved, and the processability of the PPR pipe is improved. The beta-crystal PPR pipe comprises the following components in parts by weight: 100 parts of PPR resin, 0.001-2 parts of a calcium stearate / pimelic acid Beta-crystal nucleating agent, 0.001-3 parts of aromatic amide, 0.1-15 parts of nano-inorganic powder, 0.01-1 part of a rheological agent, 0.01-1 part of an inorganic antibacterial agent, 0.01-0.3 part of an antioxidant, and 1-10 parts of color masterbatch. When the beta-crystal PPR pipe is prepared, the PPR resin, the beta-crystal nucleating agent, nano calcium carbonate, the rheological agent, the antioxidant and the color masterbatch are uniformly mixed to obtain a mixture, and the mixture is melt-extruded by a single screw extruder, shaped, cooled, pulled, cut and packed to obtain the beta-crystal PPR pipe.