The invention relates to a preparation method of leather-imitating automobile leather. The preparation method comprises the following steps: firstly designing a PU formula according to the purpose of the automobile leather, preparing slurry, coating the slurry on a piece of release paper to finish the coating process for the first time, and heating and drying the paper to obtain a surface layer of the automobile leather; secondly, adding a bridging agent, a leveling agent, a fire retardant and a microballoon foaming agent to high solid resin to be stirred uniformly, coating the prepared material on the surface layer of the automobile leather to finish the coating process for the second time, and foaming and drying to obtain an intermediate support foaming layer; coating the slurry prepared according to the PU formula on the obtained intermediate support foaming layer to finish the coating process for the third time; furthermore, adhering the formed coating to base cloth, heating and drying the cloth, and conducting separation and curling; finally, conducting postprocessing, finishing the surface, and heating and drying so as to obtain the leather-imitating automobile leather. The method disclosed by the invention is made from the environment-friendly materials during the production process, clean in production, soft and comfortable in product touch, easy to conduct post process, and capable of meeting requirements on automobile upholstery leather for customers.