The invention relates to a preparation method of a precious metal loaded alkyl aromatics isomerization catalyst; the weight of an active component Pt is 0.01 to 2.0 percent of that of a support or the weight of Pd is 0.40 to 1.2 percent of that of the support; the weight of high-silicon ratio ten-membered ring zeolite synthesized through an ionothermal synthesis method is 10 to 50 percent of that of the support, and the weight of a matrix alumina or silicon oxide is 90 to 50 percent of that of the support; the zeolite synthesized through the ionothermal process and the alumina or the silicon oxide are mixed by the ratio to be squeezed into strips, formed and calcined, then ammonium salt solution is used for exchanging the sodium ions in the zeolite, the sodium ion exchange degree is controlled to be more than 90 degrees, and then the precious metal salt solution is used for soaking or ammonium ion exchange; and the preparation method has the advantages of simplicity, high strength and yield and low cost, and the prepared catalyst has very high activity and selectivity, and simultaneously the ethylbenzene transformation capability is greatly improved.