The utility model discloses a harvester unloads grain section of thick bamboo fixing device, including the removable installing support of installing on harvester organism lateral wall, the top of installing support has the body of bending, and one side of the body of bending is fixed and is equipped with the base, and the opposite side of the body of bending is equipped with locking mechanical system fixing and bending locking bed on the body, one side of locking bed has the installation arm, has the mounting hole on the installation arm, is equipped with the perforation that corresponds with the mounting hole position on the bend body and the base respectively, still includes a lockpin, and the lockpin passes mounting hole and two perforation in proper order, and the cover is equipped with the spring on the lockpin, and the spring is located the locking bed with bend between the body, the one end of spring is fixed on the locking bed, and the other end offsets with spacing fenders that sets up on the lockpin, is close to the locking portion that is equipped with on the spacing lockpin that keeps off the piece and perforates the adaptation. Have processing and simple to operate, use cost is low, and locking is reliable, and the safety in utilization is high.