The invention relates to a synthetic method for Y zeolite (Si/Al is greater than 5.0) with a high silica alumina ratio and solves the problems that in the prior art, the synthetic steps of Y zeolite with the high silica alumina ratio are tedious, the synthetic cost is relatively high, the adverse environment effect is great and the product purity is low. The technical problem is better solved by virtue of a technical scheme which comprises the steps of: uniformly mixing a silicon source, an aluminum source, an alkaline substance A, polyethylene glycol, an alkali metal salt S and water to obtain a mixture according to an initial molar ratio of 10SiO2:(0.6-2.6)Al2O3:(2.0-3.5)alkaline substance A:(0.5-5.0) polyethylene glycol:(0-5.0) alkali metal salt S:(80-400)H2O; and performing hydrothermal crystallization on the mixture at 95-135 DEG C for 20-200 hours. The synthetic method can be used for catalytic cracking and pyrolysis industrial production.