This invention is a soaking catalyzer of hydrocabons containing rare-earth overstable Y-type molecular sieve in which all of the rare-earths exist in the state of RE(OH)3 or RE2O3. The exchangeable positions of positive ions are occupied by Na+ or H+. The X-ray powder diffracting spectrum of said molecular sieve is similar to that of conventional overstable Y-type molecular sieve, but there is a dispersive characteristic peak of RE (OH)3 or RE2O3 at the position where 2 theta angle is in the range of 27-29 deg.. Not only can the soaking catalyzer effectively decrease hydrogen transferring reactions and obviously weaken the contraction phenomenon of structure cell during thermal or hydrothermal ageing process, but also its preparing method is simple, its performance is stable, it has the ability to resist the contamination of sodium and heavy metals, and is suitable for catalyzed soak or hydrogen-added soak of heavy oil, especially for heavy oil with high sodium content.