The utility model relates to a feed bin discharge door and use feed bin of this discharge door. Including can rotating with the arc board of switching feed bin discharge gate and be used for connecting the link plate that about two intervals on the feed bin set up with the arc board around set for rotating the axis, the link plate has and is used for connecting the link of feed bin and is used for connecting arc joining of plates end, and the part that lies in between its two links of link plate is dull and stereotyped, and the plane at dull and stereotyped place is perpendicular with rotation axis extend orientation. The link that two link plates of feed bin discharge door are used for connecting the feed bin is dull and stereotyped with being used for being connected between the arc joining of plates end, and it is perpendicular that the plane and the arc board at dull and stereotyped place rotate the axis extend orientation, and the link plate is difficult to take place the deformation, simply durable, the handling ease.