The invention discloses a part grinding iron scrap collection device for whole car manufacturing. The device comprises a box. The upper surface of the box is fixedly connected with two fixed plates. The upper surface of the box is fixedly connected with the lower surface of a first driving device through a supporting rod. The first driving device is engaged with a second bevel gear. The right sideface of the second bevel gear is fixedly connected with a first rotary shaft. According to the part grinding iron scrap collection device, a first motor, a first bevel gear, the first rotary shaft, afirst bearing, an electric push rod, a first squeezing plate, a second rotary shaft, a second squeezing plate, a carrying plate, a second electric push rod, a filter screen, a magnet, a second motor,a connecting rod, a grinding roll and a third electric push rod are arranged in cooperation, staff never need to collect iron scraps manually, so that the iron scraps are prevented from being inhaledinto bodies of the staff. Accordingly, body health of the staff is guaranteed.