The invention relates to the technical field of catalyst preparation, and discloses a preparation method for a Ziegler-Natta catalyst. The preparation method comprises the following steps: firstly, subjecting magnesium halide, alcohol and an electron donor to a primary contact reaction in the presence of an inert solvent to obtain a magnesium halide alcoholate and performing primary cooling; carrying out secondary cooling on titanium halide; subjecting the cooled titanium halide, a cooled product containing the magnesium halide alcoholate and the electron donor to a secondary contact reaction;filtering the product of the secondary contact reaction to obtain the Ziegler-Natta catalyst; and subjecting the Ziegler-Natta catalyst and heated titanium halide to tertiary contact reaction. The method has the advantages of short cycle, high efficiency, etc., and is suitable for industrial production.