Comprehensive recycling method of waste rare-earth type Y-type molecular sieve catalyst

The invention relates to a comprehensive recycling method of a waste rare-earth type Y-type molecular sieve catalyst. The comprehensive recycling method includes the following steps that firstly, the waste catalyst is stirred in a mixed acid solution with low acidity, so that most of rare earth is separated from a parent solution; secondly, the solid catalyst separated out is subjected to secondary stirring treatment in a mixed acid solution with high acidity, so that enough rare earth is separated from the parent solution, and since a molecular sieve of the parent solution is subjected to two times of acid leaching, the heavy metal content loss of a slag sample is small, and subsequent utilization is easy to implement; and finally, the solid molecular sieve slag sample is ground to be ultra-fine powder, and the ultra-fine powder is blended to the preparation of an SCR catalyst so as to replace part of titanium dioxide, so that the emission of heavy metal is reduced, the intensity of formed catalysts is incre