The invention discloses a preparation method of high-strength two-layer wet blue leather, which is characterized in that various chemical materials are continuously added into a rotary drum, the rotary drum provides mechanical force through rotation to promote the chemical materials to permeate into the leather, and the leather is repeatedly washed with water to obtain the high-strength two-layerwet blue leather. A special formula is adopted in the leather making process, and chemical materials act on the leather through the rotary drum, so that the tearing resistance of the leather is greatly improved. When the product is used for automobile interior decoration, the use performance of the product can be ensured when the human body is overweight.