Fuel cell catalyst layer with excellent chemical stability and long anti-polarity time and preparation process of fuel cell catalyst layer

The invention relates to a fuel cell catalyst layer with excellent chemical stability and long anti-polarity time and a preparation process thereof. The catalyst layer comprises a proton exchange membrane, a C1 coating and a C2 coating which are sequentially attached to the cathode side of the proton exchange membrane, and an A1 coating and an A2 coating which are sequentially attached to the anode side of the proton exchange membrane. The preparation process comprises the following steps: brushing free radical removing slurry on the cathode side of the proton exchange membrane, and drying to form a C1 coating; the C1 layer is coated with cathode slurry, and a C2 coating is formed after drying; the anode side of the proton exchange membrane is coated with anode slurry, and an A1 coating is formed after drying; and coating the A1 layer with anti-reverse pole slurry, and drying to form an A2 coating, thereby finally obtaining the fuel cell catalyst layer with excellent chemical stability and long anti-reverse p