The invention provides a preparation method of an integrated NaY molecular sieve with a high silica-alumina ratio. According to the method, the NaY molecular sieve is prepared by reaction of a formed reaction substrate. The method specifically comprises the following steps: preparing a NaY molecular sieve guiding agent according to a certain proportion, and stirring and aging for 4-10 hours at 20-40 DEG C; uniformly mixing and kneading materials such as a solid silicon source, metakaolin and the guiding agent and forming, filling the formed reaction substrate in a reaction kettle for crystallization, wherein the crystallization temperature is controlled at 100-150 DEG C and the crystallization time is 5-40 hours; and after reaction, filtering, washing and drying the product to obtain the NaY molecular sieve. The method which is used for synthesizing the integrated NaY molecular sieve in one step has the characteristics of high raw material utilization ratio, high product yield and the like. Moreover, the prepared integrated NaY molecular sieve is great in area and high in activity.