The invention discloses a method for preparing a paraffin hydrocarbon shape-selective isomerization catalyst. The method comprises the following steps: 1) active ingredients are loaded to a macropore pore-forming agent, then the active ingredients are dried to obtain a modified pore-forming agent; and 2) a TON-type small grain molecular sieve, a refractoryoxide, the modified pore-forming agent, a peptizing agent and water are mixed, a mixture is shaped, dried, and calcinated to obtain the catalyst product. The method has the advantages of simple process flow and low cost, and the catalyst product used in a paraffin hydrocarbon shape-selective hydrocarbon reaction has the characteristics of high target product yield and low pour point.