The invention discloses an automatic production line for processing an automobile brake floor and a working method thereof. The production line includes a horizontally arranged robot walking ground rail, a first grasping mechanism, several numerically controlled grinding machine tools, a feeding conveyor belt, and an automobile brake floor turning table , the second grabbing mechanism, transfer conveyor belt, pneumatic debris cleaning table, control center, first inspection turntable, two drilling and tapping CNC machine tools, filter cutting fluid plate, weighing plate, coding machine, qualified products Outfeed conveyor belt, unqualified product outfeed conveyor belt, second inspection turnover table, inspection and analysis table, buffer table; through the first grabbing mechanism, grab the brake parts of the car and grind them in the CNC grinding machine, through the second grabbing mechanism The mechanism will grab the automobile brake parts for drilling, tapping and other operations, which solves the technical problems of low efficiency in processing automobile brake parts, excessive labor intensity, frequent industrial accidents and low product qualification rate in the prior art.