The invention discloses a hydrocracking catalyst for the maximum production of low-solidifying point diesel oil and a preparation method and an application thereof. The method includes the following content: (1) alumina powder, modified Y-type molecular sieve and modified Beta zeolite powder are uniformly mixed, then added with acid solution, sufficiently ground and then shaped, drying and roasting are then carried out, and thereby a catalyst carrier is obtained; (2) impregnating solution containing an active metal component is used for impregnating the catalyst carrier obtained in step (1), drying and roasting are then carried out, and thereby the hydrocracking catalyst is obtained. Since the catalyst prepared by the method adopts the novel modified molecular sieve, the catalyst has the characteristics of high hydrocracking activity and good isomerizing property, and the solidifying point of obtained hydrocracked diesel oil product is low.