The invention discloses an automatic machining production device for an automobile brake component and a working method thereof. The production device comprises a transversely-arranged robot travelling ground rail, a first grabbing mechanism, a plurality of numerical control grinding machine tools, a feeding conveying belt, an automobile brake component overturning table, a second grabbing mechanism, a transfer conveying belt, a pneumatic scrap clearing table, a control center, two drilling and tapping numerical control machine tools, a cutting fluid filtering disc, a weighing disc, a coding machine, a first qualified product discharging conveying belt, an unqualified product discharging conveying belt, a sampling inspection circulating table, a detection analysis table, a manual processing device and a second qualified product discharging conveying belt. The first grabbing mechanism grabs the automobile brake component to be ground in the numerical control grinding machine tools, and the second grabbing mechanism grabs the automobile brake component to be subjected to drilling, tapping and other operations, so that the technical problems that in the prior art, the automobile brake component machining efficiency is low, the labor intensity of workers is too large, industrial accidents frequently happen, and the product percent of pass is low are solved.