The invention discloses a reverberation chamber wall-passing motor, which comprises a motor assembly portion and a shielding layer portion. The motor assembly portion comprises a motor, a reducer, a motor base, a shaft coupler and a driving shaft. The shielding layer portion comprises a first shielding layer, a second shielding layer and a third shielding layer. The first shielding layer is a sealing aluminum foil at the connection seam between an external chamber body and the motor base; the second shielding layer is a conductive rubber shielding strip; and the third shielding layer is a metal shielding cabin, which encloses all motor assembly portion at the outer side of the external chamber body of a reverberation chamber in a seal manner. The invention also discloses a reverberation chamber wall-passing motor shielding method. Electromagnetic shielding effect is improved through a method of adding three layers of shielding layers. The method solves the problem of low electromagnetic shielding performance of the reverberation chamber wall-passing motor in hole passing at present, and reduces electromagnetic interference of the motor assembly on the reverberation chamber body andthe external environment; and through modular design of horizontal and vertical motor assemblies, assembling efficiency of the motor assembly is improved.