The invention discloses a method for preparing methyl phenyl hydrogen-containing silicone oil by rare earth super acid catalysis, which comprises the following steps of: taking methyl phenyl cyclosiloxane (DmMe, wherein m=3, 4, 5, 6), dimethyl cyclosiloxane (Dn, wherein n=3, 4, 5, 6), and methylhydrocyclosiloxane (DnH, wherein n=3, 4, 5, 6) as monomers; adding a blocking agent; and selecting rare earth super acids, controlling the reaction temperature, performing polymerization for a certain period under the protection of N2 gas, gradually raising the temperature to 205 DEG C under -0.9 MPa, and extracting low-boiling substances under reduced pressure to obtain the target product. The method has the advantages that: the catalyst can be separated only by filtering without washing neutralization, and the method has low labor intensity, simple process, simple and convenient operation and no pollution, and is convenient for industrialization. The product prepared by the method has good effects in the LED packaging process.