The invention discloses a concrete bucket, comprising a suspension arm hinged with the concrete bucket, a bucket feed hopper, a bucket discharge hopper, a discharge hopper door, an undercarriage which enables the bucket to be horizontally placed when the bucket is fallen to the ground, and a system for remotely controlling the opening and closing of the hydraumatic discharge hopper door. The inventive undercarriage is respectively connected to the bucket body and the discharge hopper. The hydraumatic system and a remote-control and so on are mounted in a steel frame boundary of the undercarriage. The steel frame has no barrier at a discharging opening of the discharging hopper, which not only ensures that when the bucket is arranged in a flat ground it is convenient to feed for the vehicle and to discharge at the discharging opening, but also prevents the discharging hopper, the hydraumatic system and the remote control device and so on from damaging caused by collision with other objects during the lifting process. The steel frame of the undercarriage has a protruding portion and an arc structure respectively arranged at two sides of the lower part. The connection portion of the protruding portion and the arc structure has a bevel relative to a horizontal state which makes the protruding portion firstly touch down when the bucket vertically touches down, and the bucket tilts along the bevel after touchdown and stably falls down and lies flat along the arc structure under the gravity action.